2019
DOI: 10.24872/rmgjournal.54.2.97
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A shallow rift basin segmented in space and time: The southern San Luis Basin, Rio Grande rift, northern New Mexico, U.S.A.

Abstract: Interpretation of gravity, magnetotelluric, and aeromagnetic data in conjunction with geologic constraints reveals details of basin geometry, thickness, and spatiotemporal evolution of the southern San Luis Basin, one of the major basins of the northern Rio Grande rift. Spatial variations of low-density basin-fill thickness are estimated primarily using a 3D gravity inversion method that improves on previous modeling efforts by separating the effects of the low-density basin fill from the effects of pre-rift r… Show more

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Cited by 6 publications
(3 citation statements)
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“…Northwest-trending lineaments associated with faults, including the Tusas and Vallecitos fault zones, in the Tusas Mountains are apparent from previous geologic mapping (e.g., Aby, 2008;Aby et al, 2010;Barker, 1958;Butler, 1946;Koning et al, 2007;Manley et al, 1987) and aeromagnetic data (Drenth et al, 2011(Drenth et al, , 2019 (Figure S5 in Supporting Information S1; Data Set S2; Thompson Jobe & Chupik, 2021). These NW-trending faults have clear geomorphic expression across the landscape, and commonly exhibit down-to-the-southwest vertical separation of Mesozoic, Miocene, and even Pliocene strata (Drenth et al, 2011).…”
Section: Nw-trending Lineaments and Faults In The Tusas Mountainsmentioning
confidence: 88%
“…Northwest-trending lineaments associated with faults, including the Tusas and Vallecitos fault zones, in the Tusas Mountains are apparent from previous geologic mapping (e.g., Aby, 2008;Aby et al, 2010;Barker, 1958;Butler, 1946;Koning et al, 2007;Manley et al, 1987) and aeromagnetic data (Drenth et al, 2011(Drenth et al, , 2019 (Figure S5 in Supporting Information S1; Data Set S2; Thompson Jobe & Chupik, 2021). These NW-trending faults have clear geomorphic expression across the landscape, and commonly exhibit down-to-the-southwest vertical separation of Mesozoic, Miocene, and even Pliocene strata (Drenth et al, 2011).…”
Section: Nw-trending Lineaments and Faults In The Tusas Mountainsmentioning
confidence: 88%
“…Criteria used to locate faults include (a) high relief on the magnetic basement surface, (b) linear trends that cross zones of shallow basement, (c) high gradient gravity anomalies (Figure S1a in Supporting Information , ROSETTA‐Ice) and (d) large contrasts in sediment thickness. Narrow, deep, linear basins are likely to be controlled by active faults (e.g., Drenth et al., 2019; Finn, 2002). We display the inferred faults upon a base map of crustal stretching factors ( β ‐factor; the ratio of crustal thickness before and after extension, Figure 4a), using an initial crustal thickness of 38 km (Müller et al., 2007), a continent‐wide Moho model (An et al., 2015), and our basement surface as the top of the crust (Text S6 in Supporting Information ).…”
Section: Methodsmentioning
confidence: 99%
“…. The mountains are now bounded on the west by the Rio Grande Rift system that became active locally during the Neogene or the late Paleogene [20,21], and is, in Colorado, geomorphically expressed as the San Luis Valley. On the east, the mountain front is adjacent to the Wet Mountain Valley that is a down-faulted block (graben) of comparable age [22].…”
Section: Geologic and Geomorphic Settingmentioning
confidence: 99%