Sedimentology and Depositional Environments of Lower Permian Yeso Formation in Northwestern New Mexico: ABSTRACT

Stanesco, John D.

doi:10.1306/44b4a852-170a-11d7-8645000102c1865d

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“…are Leonardian-aged prograding carbonate banks to rimmed platforms with slopes of 5-20 degrees (Harris, 2000) that transition into a deep basin assemblage (Figure 2; Fitchen, 1997;Asmus and Grammer, 2013;Hurd et al, 2018). The Leonardian system is composed of the proximal Yeso Formation that represents a restricted shelf environment with aeolian red beds and evaporitic deposits (Stanesco 1991;Fitchen, 1997). The Yeso Formation transitions to the open platform Victorio Peak Formation, a carbonate grain-margin (Kirkby, 1982), that transitions to the Bone Spring Formation carbonate and siliciclastic slope and basin deposits (Figure 2; Saller et al, 1989;Montgomery, 1997a;Fitchen, 1997; see Figure 2).…”

Section: Shelf-to-basin Stratigraphymentioning

confidence: 99%

Progradational Slope Architecture and Sediment Partitioning in the Outcropping Mixed Siliciclastic-Carbonate Bone Spring Formation, Permian Basin, West Texas

Walker,

Jobe,

Sarg

et al. 2019

2019 AAPG Annual Convention and Exhibition

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Sediment transport and partitioning are important for understanding slope-building processes in mixed carbonate-siliciclastic sediment routing systems. The Permian-aged Bone Spring Formation, Delaware Basin, west Texas is a mixed carbonate-siliciclastic system that has been extensively studied in its basinal extent, but poorly constrained at its proximal, upper slope segment. In this study, we constrain the stratigraphic architecture of the proximal Bone Spring Fm. outcrops in Guadalupe Mountains National Park in order to delineate the dynamics of carbonate and siliciclastic sediment delivery to the basin. These upper-slope deposits are composed predominantly of fine-grained carbonate slope facies interbedded at various scales with terrigenous hemipelagic and sediment gravity flow deposits. We identify ten slope-building clinothems that vary from siliciclastic-rich to carbonate-rich and are truncated by slope detachment surfaces that record large-scale masswasting of the shelf margin. X-ray fluorescence (XRF) data indicates that slope detachment surfaces contain a higher-than-normal proportion of terrigenous siliciclastic sediment, suggesting failure is triggered by accommodation or sediment supply changes at the shelf margin. Furthermore, a well-exposed siliciclastic-rich clinothem, identified here as the 1st Bone Spring Sand, provides evidence that carbonate and terrigenous sediment were deposited contemporaneously, suggesting both autogenic and allogenic processes influenced the Bone Spring Fm. stratigraphy. This mixing of lithologies at multiple scales and the prevalence of mass-wasting act as a primary control on the stacking patterns of siliciclastic and carbonate lithologies on not only the Bone Spring margin, but also in the distal portion of the Delaware Basin.Disclaimer: This is a confidential document and must not be discussed with others, forward in any form, or posted on websites without the express written consent of the Geological Society of America.

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