The Experts below are selected from a list of 5109 Experts worldwide ranked by ideXlab platform

Taylor J Perron - One of the best experts on this subject based on the ideXlab platform.

Michael R. Toomey - One of the best experts on this subject based on the ideXlab platform.

Zhaojie Guo - One of the best experts on this subject based on the ideXlab platform.

  • Provenance analysis of the Yumen Basin and northern Qilian Shan: Implications for the pre-collisional Paleogeography in the NE Tibetan plateau and eastern termination of Altyn Tagh fault
    Gondwana Research, 2019
    Co-Authors: Feng Cheng, Carmala Garzione, Marc Jolivet, Weitao Wang, Jibao Dong, Fabiana Richter, Zhaojie Guo
    Abstract:

    Understanding the pre-collisional Paleogeography in the NE Tibetan plateau provides insights into the growth mechanisms of the northern portion of the plateau in the Cenozoic. We conducted sandstone petrography analysis and determined U-Pb ages for detrital zircons from Cretaceous sandstone from the Yumen Basin and the northern Qilian Shan. Cretaceous strata in the northern Yumen Basin yield a unimodal age population at 290–240 Ma that indicates primary derivation from Bei Shan. Cretaceous strata in the westernmost Yumen Basin contain zircons of 2.6–2.2 Ga, 2.1–1.7 Ga, 1.4–0.7 Ga, 440–380 Ma and 300–230 Ma, suggesting source derivation from both the Qilian Shan and Bei Shan. Within the northern Qilian Shan, Cretaceous strata yield age populations of 2.8–2.3 Ga, 2.1–1.2 Ga, 480–380 Ma and ca. 270 Ma, indicating derivation from the Qilian Shan. Sandstone composition results show that a sample from the northern Qilian Shan contains more lithic fragments and plots in the recycled orogen field of the quartz-feldspar-lithics (QFL) diagram, while samples from Yumen Basin are more quartz-rich and plot close to the continental block field of the QFL diagram. This compositional difference corresponds to source variation, consistent with the detrital zircon record. Combined with existing sedimentology and low-temperature thermochronology datasets, we suggest the presence of Cretaceous topographic relief in the Bei Shan and Qilian Shan prior to India-Asia collision. Considering >300 km post-Cretaceous left-lateral offset along the Altyn Tagh Fault (ATF) and the consistently similar detrital zircon ages spectra of the samples from the Cretaceous to late Oligocene strata in the Yumen Basin, we infer the Paleogeography in the NE Tibetan plateau has been similar from the late Cretaceous to the late Oligocene with ATF termination in the western Yumen Basin instead of having been linked to strike-slip faults in the Alxa or other regions to the east since its initiation.

S T Reid - One of the best experts on this subject based on the ideXlab platform.

  • the effect of strawn desmoinesian Paleogeography and paleolatitude on the distribution of carbonate facies in the byrant g field midland basin texas
    AAPG Bulletin, 1992
    Co-Authors: D Mobil Exploration A Walker, Mobil Exploration J Golonka, Andy Reid, S T Reid
    Abstract:

    Paleogeography and paleolatitude reconstructions assisted in locating Strawn Formation grainstone shoals that form a stratigraphic trap on the eastern edge of the Byrant G field. Previous to this study, Strawn production was thought to be limited to fractured mudstoens found predominantly in the northwestern parts of the field. The grainstones were tested by a recompletion adding prolific new pay in the Strawn. The Desmoinesian paleolatitude and Paleogeography of the basin influenced carbonate sedimentation at the Byrant G field by controlling the direction of regional prevailing winds and ocean currents. Wind directions change in relation to latitude. When within 10{degree} north or south of the equator, prevailing winds generally are northeast or southeast, respectively. Because the Midland basin was very near the equator during the Desmoinesian, sedimentation at the Byrant G field would have been influenced by winds and currents from a southeasterly or northeasterly direction, depending on paleolatitude. Grain dominated sediments were predicted to accumulate on east-facing edges of structural highs because the Desmoinesian prevailing winds and ocean currents generally were easterly. Indeed, grainstones were located on the eastern or windward edges of structures in the field. They probably were deposited as beaches or marine shoals oriented slightly northeast-southwest. Furthermore » to the west, gray mudstones, representing leeward deposits, accumulated in what probably was a lagoonal environment. These facies changes indicate an environmental transition from high to low energy in an east to west direction across the field.« less

  • late paleozoic paleolatitude and Paleogeography of the midland basin texas
    AAPG Bulletin, 1992
    Co-Authors: D Mobil Exploration A Walker, Mobil Exploration J Golonka, Andy Reid, S T Reid
    Abstract:

    During the Late Pennsylvanian through Early Permian, the Midland basin was located in the low latitudes. In the Desmoinesian (Strawn), the basin was astride the equator; during the Missourian (Canyon), the center of the basin had migrated northward so it was located at 1-2N latitude. In the Virgilian (Cisco), the basin center was located around 2-4N latitude, and by the Wolfcampian, it was positioned at around 4-6N latitude. From the Desmoinesian (312 Ma) through the Missourian (306 Ma), the relative motion of the basin was 63NE. Later during the Virgilian (298 Ma) to Wolfcampian (280 Ma), the direction of motion was 24NE. This change in motion reflects a major tectonic event, occurring between the Missourian and Virgilian, that greatly modifed the movement of the Laurentian (North American) plate. At that time, Laurentia had collided with Gondwana and become part of the supercontinent Pangea. Throughout the late Paleozoic, Laurentia was rotated so the Midland basin was oriented 43{degree} northeast from its current setting. Late Paleozoic Paleogeography and paleolatitude controlled the direction of prevailing winds and ocean currents, thereby influencing the distribution of carbonate facies in the Midland basin. Present prevailing winds and ocean currents have been shown to have a majormore » impact on modern carbonate sedimentation and facies distribution in Belize, the Bahamas and Turks, and Caicos. A clearer understanding of how late Paleozoic latitude and geography affected sedimentation helps explain and predict the distribution of carbonates throughout the Midland basin.« less

Feng Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Provenance analysis of the Yumen Basin and northern Qilian Shan: Implications for the pre-collisional Paleogeography in the NE Tibetan plateau and eastern termination of Altyn Tagh fault
    Gondwana Research, 2019
    Co-Authors: Feng Cheng, Carmala Garzione, Marc Jolivet, Weitao Wang, Jibao Dong, Fabiana Richter, Zhaojie Guo
    Abstract:

    Understanding the pre-collisional Paleogeography in the NE Tibetan plateau provides insights into the growth mechanisms of the northern portion of the plateau in the Cenozoic. We conducted sandstone petrography analysis and determined U-Pb ages for detrital zircons from Cretaceous sandstone from the Yumen Basin and the northern Qilian Shan. Cretaceous strata in the northern Yumen Basin yield a unimodal age population at 290–240 Ma that indicates primary derivation from Bei Shan. Cretaceous strata in the westernmost Yumen Basin contain zircons of 2.6–2.2 Ga, 2.1–1.7 Ga, 1.4–0.7 Ga, 440–380 Ma and 300–230 Ma, suggesting source derivation from both the Qilian Shan and Bei Shan. Within the northern Qilian Shan, Cretaceous strata yield age populations of 2.8–2.3 Ga, 2.1–1.2 Ga, 480–380 Ma and ca. 270 Ma, indicating derivation from the Qilian Shan. Sandstone composition results show that a sample from the northern Qilian Shan contains more lithic fragments and plots in the recycled orogen field of the quartz-feldspar-lithics (QFL) diagram, while samples from Yumen Basin are more quartz-rich and plot close to the continental block field of the QFL diagram. This compositional difference corresponds to source variation, consistent with the detrital zircon record. Combined with existing sedimentology and low-temperature thermochronology datasets, we suggest the presence of Cretaceous topographic relief in the Bei Shan and Qilian Shan prior to India-Asia collision. Considering >300 km post-Cretaceous left-lateral offset along the Altyn Tagh Fault (ATF) and the consistently similar detrital zircon ages spectra of the samples from the Cretaceous to late Oligocene strata in the Yumen Basin, we infer the Paleogeography in the NE Tibetan plateau has been similar from the late Cretaceous to the late Oligocene with ATF termination in the western Yumen Basin instead of having been linked to strike-slip faults in the Alxa or other regions to the east since its initiation.