|Table of Contents|

Mineral Characteristics of Sediment in Jianzha Basin, the Northeastern Margin of Qinghai-Tibet Plateau, China and Their Paleo-environmental Significance(PDF)

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

Issue:
2020年第01期
Page:
86-98
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Mineral Characteristics of Sediment in Jianzha Basin, the Northeastern Margin of Qinghai-Tibet Plateau, China and Their Paleo-environmental Significance
Author(s):
WANG Yi1;  FU Chao-feng1; 2*;  SONG You-gui2;  YANG Yan-feng1
(1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, Shaanxi, China)
Keywords:
sediment;  light mineral;  heavy mineral;  mineral characteristic;  X-ray diffraction;  paleo-environment;  Jianzha Basin;  Qinghai-Tibet Plateau
PACS:
P588.2; P532
DOI:
10.19814/j.jese.2019.07022
Abstract:
By using X-ray diffraction(XRD)analysis technique, the mineral components of sediments from the sedimentary sequence spanning 11.8-5.8 Ma in Jiarang section of Jianzha Basin, the northeastern margin of Qinghai-Tibet Plateau, were analyzed. The results indicate that the mineral types of sediments in Jiarang section mainly include detrital minerals, carbonate minerals and clay minerals. Most are detrital minerals, including mainly quartz, plagioclase, muscovite and biotite, and a small amount of spinel, pyroxene(ordinary pyroxene, johannsenite and protoenstatite, etc.), rutile, corundum, magnetite, titanomagnetite, titanite and nepheline, and occasionally zircon, garnet and anatase, etc.; calcite is the main carbonate mineral, the proportion of dolomite is less; chlorite accounts for the highest proportion of clay minerals, and a small amount of hematite, vermiculite and zeolite are also found. Based on the whole rock mineral index, combined with the evolution of sedimentary facies in Jianzha Basin, and taking the variation of magnetic susceptibility as reference, the systematically mineralogical studies were carried out, and the paleo-climate environment informations of 11.8-5.8 Ma were obtained, which can be divided into 4 periods: 11.8-10.0 Ma, dry-cold climate; 10.0-8.6 Ma, warm-humid climate fluctuates; 8.6-6.2 Ma, warm-humid climate; 6.2-5.8 Ma, dry-cold climate. At about 10.0, 8.6 and 7.2 Ma, the proportion and assemblage characteristics of the main minerals have significantly changes, and the paleo-environmental conditions change dramatically at that time. It may be revealed that a series of strong tectonic movements occur extensively in the northeastern margin of Qinghai-Tibet Plateau during the period of 10-8 Ma, and the denudation from the surrounding mountains increases the sedimentary material in the area. The paleo-environmental evolution after about 7.2 Ma is mainly affected by the tectonic uplift of Qinghai-Tibet Plateau and the global climate cooling synergistically.

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