The Oligocene Goodsight-Cedar Hills half graben near Las Cruces and its implications to the evolution of the Mogollon-Datil volcanic field and to the southern Rio Grande rift

Mack, Greg H.; Nightengale, Alice L.; Seager, William R.; Clemons, Russell E.

doi:10.56577/ffc-45.135

Cited by 6 publications

(7 citation statements)

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“…The latter commonly contains lenses and thin beds of coarse sandstone, which may be massive or have horizontal laminae or trough crossbeds. Imbrication is also common in the grain-supported conglomerates and indicates paleoflow primarily to the east southeast (Mack et al, 1994a). Grain size of the conglomerates ranges from boulders up to 1 m (3.3 ft) in length to pebbles and granules, and generally decreases to the east-southeast.…”

Section: Descriptionmentioning

confidence: 99%

“…Most of the andesite clasts are derived from the Palm Park Formation, although a few may represent Upper Cretaceous volcanic gravel reworked out of the Love Ranch Formation. One of the upper most conglomerates at Point of Rocks also contains a few clasts of flow-banded rhyolite, which were probably derived from the Cedar Hills vent zone, located south of the Caballo Mountains (Mack et al, 1994a).…”

Section: Descriptionmentioning

confidence: 99%

“…Plinian eruptions presum ably mantled the countryside with largely sand-sized tephra, which was quickly redistributed toward topographically low areas by sheetfloods, shallow streamflows, or debris flows. Following the terminology of Smith (1991), Mack et al (1994a) referred to these rocks as "syneruption facies. "…”

Section: Depositional Environmentsmentioning

confidence: 99%

“…Once the fallout tephra was removed from upland areas, bedrock was exposed and supplied gravel and sand to the Bell Top Basin. Mack et al (1994a) referred to these rocks as "post eruption facies." The coarse grain size and paucity of interbedded fines within the post-eruption facies suggest they were deposited on alluvial fans.…”

Section: Depositional Environmentsmentioning

confidence: 99%

“…Most of the post-eruption conglomerates were deposited by sheetflood or streamflood processes, although the matrix-supported variety probably represents debris flows. Paleoflow on the fans was to the east-southeast (Mack et al, 1994a). Red mudstone probably accumulated between fans or beyond the toes of the fans in an alluvial-flat setting.…”

Section: Depositional Environmentsmentioning

confidence: 99%

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Geology of the Caballo Mountains, New Mexico

Seager¹,

Mack²

2003

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The Caballo Mountains, just south of Truth or Consequences, rise to an elevation of 7,065 feet. Today they are flanked on the west side by Caballo Reservoir and on the east side by the Jornada del Muerto. An extraordinary geologic section is preserved here. Precambrian igneous and metamorphic rocks (granites and schists) provide a view of the Precambrian history of this part of the country, and an extraordinary thickness of sedimentary rocks (whose collective thickness is more than 3.5 miles) gives us an unparalleled picture of the evolution of southern New Mexico. Development of these mountains began with compression and uplift associated with the Laramide orogeny, at the end of the Mesozoic. Since then the complex geologic history of this part of New Mexico has included uplift, erosion, faulting, volcanic activity, continental deposition, and, finally, the development of the Rio Grande rift. That complex geologic history is well documented in this volume. This memoir is the result of many years of study and field work on the part of the authors, who have drawn together in one place this comprehensive description of the region. The volume is heavily illustrated with photographs, maps, stratigraphic sections, and other graphics. It contains both an index and a glossary.

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Section: Descriptionmentioning

confidence: 99%

Section: Descriptionmentioning

confidence: 99%

Section: Depositional Environmentsmentioning

confidence: 99%

Section: Depositional Environmentsmentioning

confidence: 99%

Section: Depositional Environmentsmentioning

confidence: 99%

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Geology of the Caballo Mountains, New Mexico

Seager¹,

Mack²

2003

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Evidence from mantle xenoliths for lithosphere removal beneath the central Rio Grande Rift

Byerly

Lassiter

2012

Earth and Planetary Science Letters

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Endorheic‐Exorheic Transitions of the Rio Grande and East African Rifts

Berry

Wijk

Cadol

et al. 2019

Geochem Geophys Geosyst

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Tectonic extension of continental lithosphere creates accommodation space in which sediments are deposited. Climate‐driven processes provide the mechanism by which mass is detached from hillslopes and sediments are transported into this accommodation space. These two forcings, climate and tectonics, act together to create either endorheic (internally drained) or exorheic (externally drained) rift basins. Here we use a large‐scale dynamic landscape evolution‐tectonics model to understand the contribution of tectonic processes in endorheic‐exorheic transitions. In the model, extension results in opening of an asymmetric half‐graben along a listric normal fault. Rift opening occurs in the models in wet, temperate, or semiarid climates where runoff and evapotranspiration are varied. Our numerical experiments show that slow rift‐opening rates, a slowing‐down of rift opening, or increase of headwater topography (e.g., upstream epeirogenic uplift), are tectonic situations that can cause a transition from an endorheic to an exorheic drainage state in a rift basin. Our results also show that wet climate conditions lead to a permanent exorheism that persists regardless of rift‐opening rates. In semiarid climates, endorheic conditions are favored and may last for the duration of rifting except for when rift opening is very slow. These results form an interpretive framework to study endorheic and exorheic drainage systems in natural continental rifts. In the slow‐opening Rio Grande rift, the endorheic‐exorheic transition may have occurred without dramatic climate changes. Lake‐level variations in East African rift basins are predicted by our models to result from variations in climate.

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The Oligocene Goodsight-Cedar Hills half graben near Las Cruces and its implications to the evolution of the Mogollon-Datil volcanic field and to the southern Rio Grande rift

Cited by 6 publications

References 0 publications

Geology of the Caballo Mountains, New Mexico

Geology of the Caballo Mountains, New Mexico

Evidence from mantle xenoliths for lithosphere removal beneath the central Rio Grande Rift

Endorheic‐Exorheic Transitions of the Rio Grande and East African Rifts

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