ABSTRACT: The distinction between depositional belts associated with the basin axis and flanking ... more ABSTRACT: The distinction between depositional belts associated with the basin axis and flanking piedmont streams is a fundamental attribute of the stratigraphic architecture of intracontinental rift basins. Spatiotemporal distributions of these lithofacies associations are sensitive to a combination of factors, including basin geometry, subsidence rate, and sediment discharge; however, most studies have focused on one or two controls and one depositional component (axial or tributary) of the basin-fill succession. A new perspective on how these depositional belts develop under simple but precisely controlled boundary conditions of steady subsidence, sediment flux, and water discharge is achieved through the creation of an experimental stratigraphic succession. The Experimental EarthScape run in 2006 (XES06) focused on the geomorphic evolution of sedimentary successions within an asymmetrically subsiding basin, analogous to a simple half graben, containing four interacting supply po...
Current geologic studies of the southwestern Jemez Mountains refine the stratigraphy of the Albuq... more Current geologic studies of the southwestern Jemez Mountains refine the stratigraphy of the Albuquerque basin of the Rio Grande rift. In the Rio Jemez drainage, between the towns of Gilman and Cañon, New Mexico, a previously unrecognized stratigraphic relationship between the Abiquiu Formation and the Zia Formation clarifies the tectonic history of the region. The Zia Formation overlies older rocks provisionally assigned to the Abiquiu Formation. Examination of drill-hole cuttings from the Tamara #1-Y well in the adjacent Albuquerque basin reveal a thick pre-Zia Formation stratigraphic succession assigned to the unit of Isleta well #2. This unit locally exceeds 2 km in thickness in other wells in the Albuquerque basin. The unit of Isleta well #2 is represented by a thin discontinuous lag of intermediate volcanic tuff ventifacts preserved on the footwall of the San Ysidro fault zone. Thickness variations within the unit of Isleta well #2 across documented geologic structures across a...
ABSTRACT: The distinction between depositional belts associated with the basin axis and flanking ... more ABSTRACT: The distinction between depositional belts associated with the basin axis and flanking piedmont streams is a fundamental attribute of the stratigraphic architecture of intracontinental rift basins. Spatiotemporal distributions of these lithofacies associations are sensitive to a combination of factors, including basin geometry, subsidence rate, and sediment discharge; however, most studies have focused on one or two controls and one depositional component (axial or tributary) of the basin-fill succession. A new perspective on how these depositional belts develop under simple but precisely controlled boundary conditions of steady subsidence, sediment flux, and water discharge is achieved through the creation of an experimental stratigraphic succession. The Experimental EarthScape run in 2006 (XES06) focused on the geomorphic evolution of sedimentary successions within an asymmetrically subsiding basin, analogous to a simple half graben, containing four interacting supply po...
Current geologic studies of the southwestern Jemez Mountains refine the stratigraphy of the Albuq... more Current geologic studies of the southwestern Jemez Mountains refine the stratigraphy of the Albuquerque basin of the Rio Grande rift. In the Rio Jemez drainage, between the towns of Gilman and Cañon, New Mexico, a previously unrecognized stratigraphic relationship between the Abiquiu Formation and the Zia Formation clarifies the tectonic history of the region. The Zia Formation overlies older rocks provisionally assigned to the Abiquiu Formation. Examination of drill-hole cuttings from the Tamara #1-Y well in the adjacent Albuquerque basin reveal a thick pre-Zia Formation stratigraphic succession assigned to the unit of Isleta well #2. This unit locally exceeds 2 km in thickness in other wells in the Albuquerque basin. The unit of Isleta well #2 is represented by a thin discontinuous lag of intermediate volcanic tuff ventifacts preserved on the footwall of the San Ysidro fault zone. Thickness variations within the unit of Isleta well #2 across documented geologic structures across a...
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