|Table of Contents|

Early-middle Permian Tectonic-lithofacies Palaeogeographic Characteristics in Qaidam Basin and Its Adjacent Areas(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2012年第02期
Page:
1-14
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Early-middle Permian Tectonic-lithofacies Palaeogeographic Characteristics in Qaidam Basin and Its Adjacent Areas
Author(s):
CHEN Shou-jian;  CHEN Fen-ning;  JI Wen-hua;  LI Rong-she;  LUO Chang-yi;  LIU Rong-li;  LI Guo-dong
Xi'an Institute of Geology and Mineral Resources, Xi'an 710054, Shaanxi, China
Keywords:
Qaidam Basin;  Early-middle Permian;  tectonic-lithofacies paleogeography;  Bayankala ocean basin;  Hualixi tectonic movement;  geological evolution
PACS:
P588.2; P531; P56
DOI:
-
Abstract:
Through the field observation, the analysis of test data, the comprehensive regional geological survey and the previous research result, the forming mechanism and tectonic-lithofacies paleogeography during the Early-middle Permian in Qaidam Basin and its adjacent areas were discussed. The results showed that the Early-middle Permian in the central and northern parts of Qaidam Basin and its adjacent areas was intracontinental basin-and-range and rift valley system, and mainly located on extensional tectonic setting, and the tectonic paleogeography was graben and horst alternately; the Early-middle Permian in the southern part was the period with most violent expansion cosmically in Bayankala ocean basin, and ocean-island and seamount were all over the ocean basin; the strong Hualixi tectonic movement in the late of Early-middle Permian caused that the relative movement was intensified between the ancient plates, the ocean lithosphere plate of Bayankala ocean basin dived to the north, so that East Kunlun epicontinental magmatic arc and the accretion zone in south were formed, magmation in the arc was strong, Zongwulong Mountain-West Qinling Mountain terrigenous rift basin further developed, and the complicated tectonic-lithofacies paleogeography was formed subsequently. The Early-middle Permian was the turning point from violent expansion to violent convergence for geodynamics mechanism in Qaidam Basin and its adjacent areas; strengthening the study on the tectonic-lithofacies paleogeography was significant for building the stratum sequence, discussing the geological evolution history and mineral deposit prospecting.

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Last Update: 2012-06-20