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Recent extensional tectonics_moon_revealed_lunar_reconnaissance_orbiter_camera
1.
LETTERS
PUBLISHED ONLINE: 19 FEBRUARY 2012 | DOI: 10.1038/NGEO1387 Recent extensional tectonics on the Moon revealed by the Lunar Reconnaissance Orbiter Camera Thomas R. Watters1 *, Mark S. Robinson2 , Maria E. Banks1 , Thanh Tran2 and Brett W. Denevi3 Large-scale expressions of lunar tectonics—contractional of the Pasteur scarp (∼8.6◦ S, 100.6◦ E; Supplementary Fig. S1) are wrinkle ridges and extensional rilles or graben—are directly ∼1.2 km from the scarp face (Fig. 1b). Unlike the Madler graben, related to stresses induced by mare basalt-filled basins1,2 . the orientation of the Pasteur graben are subparallel to the scarp and Basin-related extensional tectonic activity ceased about extend for ∼1.5 km, with the largest ∼300 m in length and 20–30 m 3.6 Gyr ago, whereas contractional tectonics continued until wide (Supplementary Note S3). about 1.2 Gyr ago2 . In the lunar highlands, relatively young Lunar graben not located in the proximal back-limb terrain contractional lobate scarps, less than 1 Gyr in age, were first of lobate scarps have also been revealed in LROC NAC images. identified in Apollo-era photographs3 . However, no evidence Graben found in the floor of Seares crater (∼74.7◦ N, 148.0◦ E; of extensional landforms was found beyond the influence of Supplementary Fig. S1) occur in the inter-scarp area of a cluster of mare basalt-filled basins and floor-fractured craters. Here seven lobate scarps (Fig. 1c). These graben are found over an area we identify previously undetected small-scale graben in the <1 km2 and have dimensions comparable to those in back-scarp farside highlands and in the mare basalts in images from the terrain, ∼150–250 m in length and with maximum widths of Lunar Reconnaissance Orbiter Camera. Crosscut impact craters ∼10–30 m. A NAC stereo-derived digital terrain model8 reveals that with diameters as small as about 10 m, a lack of superposed the Seares graben occur in a relatively low-lying inter-scarp area. craters, and graben depths as shallow as ∼1 m suggest these A series of graben deform mare basalts that occupy a valley pristine-appearing graben are less than 50 Myr old. Thus, ∼20 km wide (∼33.1◦ S, 323◦ E; Supplementary Fig. S1) south of the young graben indicate recent extensional tectonic activity Mare Humorum and the Vitello impact crater (Fig. 2a,b). Here on the Moon where extensional stresses locally exceeded the graben flank a wrinkle ridge that is part of a ridge–lobate compressional stresses. We propose that these findings may scarp transition (Fig. 2a), a structure in which the highland lobate be inconsistent with a totally molten early Moon, given that scarp transitions into a wrinkle ridge where it crosses the contact thermal history models for this scenario predict a high level of with the mare basalts (see ref. 2). The Vitello graben are E–W late-stage compressional stress4–6 that might be expected to to NE–SW oriented and extend over ∼3.5 km (Fig. 2b). These completely suppress the formation of graben. graben exhibit en echelon steps, indicating that faults most probably Basin-localized lunar tectonics resulted in both basin-radial grew by segment linkage (see ref. 9). Lengths of the Vitello and basin-concentric graben and wrinkle ridges. Typically, basin- graben vary from tens of metres up to ∼600 m, with a maximum localized graben are found near basin margins and in the adjacent width of ∼15 m. Unlike the graben associated with lobate scarps, highlands whereas wrinkle ridges are restricted to the basin these graben occur over a larger area, and many are regularly interior (ref. 2, plate 6) (Supplementary Note S1). The dominant spaced, separated by ∼100–200 m. Pit chains occur within some contractional tectonic landform found outside of mare basins are of the Vitello graben (Fig. 2c). These pits are circular to elliptical lobate scarps2,3 . These small-scale scarps are thought to be the in shape and are up to ∼15 m in diameter, spanning the full surface expression of thrust faults3 . Crosscutting relations with width of the graben. Such depressions are commonly associated Copernican-age, small-diameter impact craters indicate the lobate with extensional landforms on solid bodies in the Solar System scarps are relatively young, less than 1 Gyr old (ref. 3). and are thought to be the results of collapse of material into Small-scale graben revealed in 0.5–2.0 m/pixel Lunar Recon- subsurface voids from dilation accompanying faulting or explosive naissance Orbiter Camera (LROC) Narrow Angle Camera (NAC) outgassing following magma emplacement at shallow depth10,11 . images are often associated with lobate scarps (Supplementary Lunar Orbiter Laser Altimeter (LOLA) profiles across the graben Note S2). These graben were first found in the back-limb area of the show their location is spatially correlated with a topographic rise Lee–Lincoln scarp3,7 (∼20.3◦ N, 30.5◦ E) and are spatially correlated that has a maximum relief of ∼16 m (Fig. 2b). Although many with a narrow rise along the crest of the scarp face and the elevated of the Vitello graben are <1 km from the wrinkle ridge, the back-limb terrain3 . Newly detected graben found in the back-limb topographic rise is not directly associated with the structural relief terrain of the Madler scarp (∼10.8◦ S, 31.8◦ E; Supplementary of the wrinkle ridge. Fig. S1) are located ∼2.5 km from the scarp face (Fig. 1a). The Of the newly detected graben, the largest are located in the orientation of these graben is roughly perpendicular to the trend farside highlands (∼17.8◦ N, 180.8◦ E; Supplementary Fig. S1), of the scarp. The dimensions of the graben vary, with the largest about 130 km northeast of the Virtanen impact crater. The NW-SE being ∼40 m wide and ∼500 m long. Graben in the back-limb area orientated Virtanen graben extend over an area ∼11 km long 1 Center for Earth and Planetary Studies, Smithsonian Institution, Washington, District of Columbia 20560, USA, 2 School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85251, USA, 3 The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723, USA. *e-mail: watterst@si.edu. NATURE GEOSCIENCE | ADVANCE ONLINE PUBLICATION | www.nature.com/naturegeoscience 1 © 2012 Macmillan Publishers Limited. All rights reserved.
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NATURE GEOSCIENCE DOI: 10.1038/NGEO1387 a c 750 m b 1 km 500 m Figure 1 | Small-scale graben with lobate scarps. a, Madler scarp, in northern Mare Nectaris (∼10.8◦ S, 31.8◦ E), has graben (black arrows) oriented perpendicular to the scarp face (white arrows). LROC NAC frames M116107010L and M116107010R. b, Graben (black arrows) associated with the highland Pasteur scarp (∼8.6◦ S, 100.6◦ E) are oriented parallel to the scarp face (white arrows). LROC NAC frame M103854211L. c, Graben on the floor of Seares crater (∼74.7◦ N, 148.0◦ E). The graben (inset) are located in the inter-scarp area of a cluster of lobate scarps (one indicated by white arrows). Width of the inset box is ∼900 m. LROC NAC frames M156626383L and M156626383R. (Fig. 3a) and up to ∼1.6 km wide. The largest graben has a diameter. Craters with diameters down to ∼10 m are deformed by maximum width of ∼500 m (Fig. 3b). The Vitello graben and graben (Fig. 4a). Similarly, the Vitello graben crosscut craters with those associated with lobate scarps can be described as simple diameters as large as ∼250 m and as small as ∼7 m (Fig. 4b). Lunar graben, structures characterized by individual troughs with lengths craters with diameters of 50–100 m or smaller, and fresh craters that greatly exceed widths. The Virtanen graben are complex, up to 400 m in diameter are Copernican in age12 , estimated to be consisting of closely spaced and overlapping segments that exhibit ∼800 ± 15 Myr at most (defined by the age of Copernicus crater)13 . complex fault linkages. Bounding faults of the graben are often Shallow depressions in the lunar regolith are estimated to fill in segmented, and in some cases individual fault segments are linked at a rate of 5 ± 3 cm Myr−1 , based on analysis of boulder tracks14 . by relay ramps, downward-sloping landforms bounded by two At this rate of in-filling, graben formed in regolith with depths adjacent, overlapping normal faults (Fig. 3c). This graben complex of ∼1 m would be expected to disappear in ∼12.5–50 Myr. Thus, resembles those seen in larger-scale planetary rift systems9 and is the small-scale graben probably formed less than 50 Myr ago. The unlike any found previously on the Moon. NAC stereo-derived presence of shallow, small-scale graben in the back-limbs of lobate topography shows that the graben occur on the slopes, and along scarps is consistent with the interpretation that lobate scarps are the crest, of a ridge-like rise with several hundred metres of relief young tectonic landforms3 . (Supplementary Note S4). The depths of the graben vary from Crater density ages of the mare basalts indicate that no large- ∼17 m to ∼1 m (Supplementary Fig. S4). The graben and rise are scale mare units younger than ∼3.6 ± 0.2 Gyr are crosscut by located on the floor of a heavily degraded, pre-Nectarian basin graben15–18 , suggesting that mare basin-related extension ceased not ∼580 km in diameter (Supplementary Fig. S1). A lobate scarp, one long after the end of the period of the late heavy bombardment of a cluster of scarps with orientations subparallel to the graben, (∼3.8 Gyr). The cessation of basin-related flexural extension due occurs ∼8 km south of the Virtanen graben (Fig. 3a). LOLA profiles to loading by mare basalts may be the result of the superposition crossing the scarp show that it has ∼30 m of relief. However, the of compressional stresses from global contraction, marking a stage large distance (8 km) between the graben and the scarp makes a in the Moon’s thermal history at which interior cooling resulted direct link problematic. in a shift from net expansion to net contraction19,20 . The level The overall crisp morphology and a lack of superposed, of compressional stresses from the observed population of young relatively large-diameter (>400 m) impact craters (see ref. 12) thrust faults is estimated to be ∼10 MPa (ref. 3). This estimate show that the newly discovered graben are young. The largest is consistent with thermal models for an early Moon with an impact crater superimposed on the Virtanen graben is ∼180 m in initially hot exterior and magma ocean that predict a relatively 2 NATURE GEOSCIENCE | ADVANCE ONLINE PUBLICATION | www.nature.com/naturegeoscience © 2012 Macmillan Publishers Limited. All rights reserved.
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NATURE GEOSCIENCE DOI:
10.1038/NGEO1387 LETTERS a b 20 m 2b 2c 5 km 500 m c 150 m Figure 2 | Vitello graben in nearside mare basalts (∼33.1 ◦ S, 323◦ E). a, The graben occur in mare basalts south of Mare Humorum, near a wrinkle ridge that is part of a lobate scarp–wrinkle ridge transition (white arrows). LROC Wide Angle Camera (WAC) mosaic. b, The Vitello graben are regularly spaced and LOLA topography shows they formed on a low-relief, topographic rise (white dots are elevations plotted along the LOLA ground track, scale bar for elevation plot shown in upper left). LROC NAC image frame M104756463R, location is shown in a. c, Graben exhibit en echelon steps and pit crater chains. LROC NAC frame M104756463R, location is shown in b. low level of global compressional stress, 100 MPa or less since the near-surface crust and regolith (see ref. 3). In this case, the end of the late heavy bombardment19–21 . The presence of compressional stresses may have been locally relaxed by the relatively young graben on the Moon shows localized extension formation of the scarps and extension limited to back-limb, near- in a dominantly contractional regime. Because extensional stresses surface regolith layers. Thus, local extensional stresses need not must locally exceed the compressional stresses for normal faults exceed global compressional stresses for graben to form. to form, these graben may have implications for the current state In contrast, late-stage compressional stresses in the near-surface of stress if the near-surface crustal materials they deform were materials deformed by the Seares, Virtanen, and Vitello graben not isolated from the background stresses or the background may not have been relaxed by contractional tectonic features. stresses were not relaxed. The total extensional stress necessary to The inter-scarp graben of the Seares cluster could have formed form shallow-depth normal faults (in the presence of a ∼10 MPa in response to extensional stresses induced by dilation from the background compressional stress) is estimated to be on the development of the surrounding lobate scarps. With the available order of 12 MPa (Supplementary Note S5). Thus, the localized data, the Virtanen and Vitello graben cannot be directly connected formation of small-scale graben may be consistent with a recent to the structural relief of the nearby contractional tectonic low level of global compressional stress. Higher levels of late-stage landforms. Also, there are no nearby Copernican-age impact compressional stress predicted in nearly, or totally molten, early- craters on the scale of Virtanen or Vitello graben that might have Moon thermal models (up to 350 MPa; refs 4–6) are expected influenced their formation, ruling out impact-induced stresses. to largely or completely suppress normal faulting. It has been If the formation of these graben is not related to contraction, suggested that the small-scale lunar thrust fault scarps could result an alternate explanation for the topography and extensional from high levels of compressional stress if significant contractional stresses is localized uplift due to shallow volcanic intrusives in strain is accommodated by the near-surface pervasively fractured the form of laccoliths. Laccolith intrusions can result in uplift crustal zone and regolith6 . and flexural bending of the overlying material (Supplementary The extensional stresses that formed the graben located in the Note S6). This mechanism has been proposed to account for uplift back-limb areas of lobate scarps are probably due to uplift and and extension in lunar floor-fractured craters22–25 (Supplementary flexural bending in response to slip on underlying scarp-related Note S1). It must be noted, however, that there is currently no thrust faults, where bending stresses cause normal faulting of direct evidence of young (<100 Myr) extrusive volcanism on the NATURE GEOSCIENCE | ADVANCE ONLINE PUBLICATION | www.nature.com/naturegeoscience 3 © 2012 Macmillan Publishers Limited. All rights reserved.
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NATURE GEOSCIENCE DOI: 10.1038/NGEO1387 a b c 3b 3c 5 km 750 m 200 m Figure 3 | Virtanen graben in the farside highlands (∼17.8 ◦ N, 180.8◦ E). a, The graben extend over 11 km (white arrows) and crosscut the northern rim of a heavily degraded ∼2.5 km diameter crater. A lobate scarp with a similar orientation to the graben is located to the southeast (black arrow). LROC WAC mosaic. b, These graben are the largest and most complex of the newly detected extensional features. LROC NAC frames M136362376L and M136362376R, location is shown in a. c, Graben are linked by relay ramps, downward-sloping landforms bounded by two adjacent, overlapping normal faults. Figure location is shown in b. a b 750 m 500 m Figure 4 | Crosscutting relations between graben and impact craters. a, The Virtanen graben (∼17.8◦ N, 180.8◦ E) crosscut the rim of a degraded 2.5 km diameter impact crater and smaller craters with diameters down to ∼25 m (inset, upper white arrow) and ∼10 m (inset, lower white arrow). The width of the inset box is ∼430 m. LROC NAC image frames M136362376L and M136362376R. b, The Vitello graben crosscut a degraded ∼27 m diameter crater (inset, upper white arrow) and a ∼7 m diameter crater (inset, lower white arrow). The width of the inset box is ∼300 m. LROC NAC image frame M104756463R. Moon17,18,26 that would substantiate this mechanism. Regardless Received 13 June 2011; accepted 5 January 2012; published online of the mechanism for generating the extensional stresses, if the 19 February 2012 background compressional stresses have not been locally relaxed or References the deformed materials mechanically isolated, these young graben 1. Wilhelms, D. E. in The Geologic History of the Moon Vol. 1348 (US Geol. Surv. may provide evidence that the late-stage global compressional stress Prof. Paper, 1987). in the lunar crust was low. 2. Watters, T. R. & Johnson, C. L. in Planetary Tectonics (eds Watters, T. R. & The young age of the graben (perhaps 50 Myr) along with Schultz, R. A.) 121–182 (Cambridge Univ. Press, 2010). 3. Watters, T. R. et al. Evidence of recent thrust faulting on the Moon revealed by the contractional lobate scarps3 show that significant recent the Lunar Reconnaissance Orbiter Camera. Science 329, 936–940 (2010). tectonic activity has taken place on the Moon. Recent tectonic 4. Binder, A. B. Post-Imbrian global lunar tectonism: Evidence for an initially activity is consistent with Apollo seismic data2,27 . Of the recorded totally molten moon. Earth Moon Planets 26, 117–133 (1982). moonquakes, 28 were shallow (<100 km depth; see refs 2,27) and 5. Binder, A. B. & Lange, M. A. On the thermal history of the moon of fission some have best-fit depths in the crust and near the surface28 . origin. Moon 17, 29–45 (1980). 6. Pritchard, M. E. & Stevenson, D. J. in Origin of the Earth and Moon Although many shallow moonquakes seem to occur at the edges (eds Canup, R. & Righter, K.) (Univ. Arizona Press, 2000). of mare basins, others are located in the nearside highlands2,27 . 7. Wolfe, E. W. et al. in The Geologic Investigation of the Taurus-Littrow Valley, Slip on faults associated with the young graben and lobate scarps Apollo 17 Landing Site Vol. 1080 (US Geol. Surv. Prof. Paper, 1981). may be possible sources of some of the shallow moonquakes. 8. Tran, T. et al. Generating digital terrain models using LROC NAC images. At Reprocessing of deep seismic event records suggests the lunar outer ASPRS/CaGIS 2010 Fall Specialty Conference (ISPRS Technical Commission VI & AutoCarto, 2010). core is fluid and surrounded by a partially molten boundary layer29 . 9. Schultz, R. A., Hauber, E., Katternhorn, S. A., Okubo, C. H. & Watters, T. R. Thus, cooling of a still hot interior may have driven recent geologic Interpretation and analysis of planetary structures. J. Struct. Geol. 32, activity on the Moon. 855–875 (2010). 4 NATURE GEOSCIENCE | ADVANCE ONLINE PUBLICATION | www.nature.com/naturegeoscience © 2012 Macmillan Publishers Limited. All rights reserved.
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10.1038/NGEO1387 LETTERS 10. Wyrick, D., Ferrill, D. A., Morris, A. P., Coltion, S. L. & Sims, D. W. 24. Wichmanand, R. W. & Schultz, P. H. Floor-fractured craters in Mare Smythii Distribution, morphology, and origins of Martian pit crater chains. J. Geophys. and west of Oceanus Procellarum: Implications of crater modification Res. 109, E06005 (2004). by viscous relaxation and igneous intrusion models. J. Geophys. Res. 100, 11. Head, J. W. & Wilson, L. Lunar graben formation due to near-surface 21201–21218 (1995). deformation accompanying dike emplacement. Planet. Space Sci. 41, 25. Dombard, A. J. & Gillis, J. J. Testing the viability of topographic relaxation as a 719–727 (1993). mechanism for the formation of lunar floor-fractured craters. J. Geophys. Res. 12. Trask, N. J. in Geologic Comparison of Mare Materials in the Lunar Equatorial 106, 27901–27910 (2001). Belt, Including Apollo 11 and Apollo 12 Landing Sites Vol. 750-D D138–D144 26. Schultz, P. H. & Spudis, P. D. The beginning and end of lunar volcanism. (US Geol. Survey Prof. Paper, 1971). Nature 302, 233–236 (1983). 13. Stöffler, D. & Ryder, G. Stratigraphy and isotope ages of lunar geologic 27. Nakamura, Y. et al. Shallow moonquakes: Depth, distribution and implications units: Chronological standard for the inner solar system. Space Sci. Rev. 96, as to the present state of the lunar interior. Proc. Lunar Sci. Conf. 10, 9–54 (2001). 2299–2309 (1979). 14. Arvidson, R., Drozd, R. J., Hohenberg, C. M., Morgan, C. J. & Poupeau, G. 28. Gagnepain-Beyneix, J., Lognonné, P., Chenet, H. & Spohn, T. Seismic models Horizontal transport of the regolith, modification of features, and erosion rates of the Moon and constraints on temperature and mineralogy. Phys. Earth on the lunar surface. Moon 13, 67–79 (1975). Planet. Int. 159, 140–166 (2006). 15. Lucchitta, B. K. & Watkins, J. A. Age of graben systems on the Moon. 29. Weber, R. C., Lin, P., Garnero, E. J., Williams, Q. & Lognonné, P. Seismic Proc. Lunar Planet. Sci. Conf. 9, 3459–3472 (1978). detection of the lunar core. Science 331, 309–312 (2011). 16. Boyce, J. M. Ages of flow units in the lunar nearside maria based on Lunar Orbiter IV photographs. Proc. Lunar Planet. Sci. Conf. 7, Acknowledgements 2717–2728 (1976). We thank H.J. Melosh for helpful comments that greatly improved the manuscript. We 17. Hiesinger, H., Jaumann, R., Neukam, G. & Head, J. W. Ages of mare basalts on gratefully acknowledge the LRO and LROC engineers and technical support personnel. the lunar nearside. J. Geophys. Res. 105, 29239–29276 (2000). This work was supported by National Aeronautics and Space Administration (NASA) 18. Hiesinger, H., Head, J. W., Wolf, U., Jaumann, R. & Neukum, G. Ages and Grant NNX08AM73G. stratigraphy of mare basalts in Oceanus Procellarum, Mare Nubium, Mare Cognitum, and Mare Insularum. J. Geophys. Res. 108, E75065 (2003). 19. Solomon, S. C. & Head, J. W. Vertical movement in mare basins: relation to Author contributions mare emplacement, basin tectonics and lunar thermal history. J. Geophys. Res. T.R.W. drafted the manuscript. M.S.R. is the principal investigator of the LRO Cameras, 84, 1667–1682 (1979). was responsible for development and operation of the camera system, and contributed 20. Solomon, S. C. & Head, J. W. Lunar mascon basins: Lava filling, to scientific interpretations. M.E.B. assisted with NAC image processing and the tectonics, and evolution of the lithosphere. Rev. Geophys. Space Phys. 18, identification of tectonic features. T.T. generated the NAC digital terrain models used in 107–141 (1980). the investigation. B.W.D. assisted in the age estimates of the tectonic features. All of the 21. Solomon, S. C. & Chaiken, J. Thermal expansion and thermal stress in the Moon authors contributed to interpretation and analysis of the data. and terrestrial planets: Clues to early thermal history. Proc. Lunar Sci. Conf. 7, 3229–3243 (1976). Additional information 22. Schultz, P. H. Floor-fractured lunar craters. Moon 15, 241–273 (1976). The authors declare no competing financial interests. Supplementary information 23. Hall, J. L., Solomon, S. C. & Head, J. W. Lunar floor-fractured craters: accompanies this paper on www.nature.com/naturegeoscience. Reprints and permissions Evidence for viscous relaxation of crater topography. J. Geophys. Res. 86, information is available online at http://www.nature.com/reprints. Correspondence and 9537–9552 (1981). requests for materials should be addressed to T.R.W. NATURE GEOSCIENCE | ADVANCE ONLINE PUBLICATION | www.nature.com/naturegeoscience 5 © 2012 Macmillan Publishers Limited. All rights reserved.
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