|Table of Contents|

Geochemical Features and Geological Significance of Late Ladinian-Norian Meta-basalt in Tabai Area of Gejiu, Yunnan, China(PDF)

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

Issue:
2021年第05期
Page:
829-849
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemical Features and Geological Significance of Late Ladinian-Norian Meta-basalt in Tabai Area of Gejiu, Yunnan, China
Author(s):
LIN Hong-hong1;  ZHANG Bao-lin2;  SHEN Xiao-li1*;  DU Qing-xiang1; SU Jie3;  JIA Wen-chen4
(1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Honghe State Bureau of Land and Resources, Yunnan Province, Mengzi 661000, Yunnan, China; 4. Beijing Technology Consulting Branch, China Railway Resources Group Co., Ltd., Beijing 100070, China)
Keywords:
Late Ladinian-Norian;  high-Ti alkaline basalt;  Sr-Nd isotope;  fractional crystallization;  mantle plume;  Emeishan high-Ti basalt;  continental intraplate environment;  Yunnan
PACS:
P588.14+5
DOI:
10.19814/j.jese.2021.02011
Abstract:
Gejiu area in Yunnan is located at a faulted depression basin in the southwestern of Youjiang continental margin rift basin, which is the transitional zone between Yangtze platform and South China Caledonian geosyncline, and the tectonic location is in the southwestern South China. The geology, geochemistry of Late Ladinian-Norian meta-basalt in Tabai area of Gejiu, Yunnan indicate that these basalts have undergone strong metamorphism because of regional dynamic tectonics. The meta-basalts are characterized by low contents of silica, calcium, magnesium, and enrichment of incompatible elements(Ti, P, K, etc.). They can be classified as high-Ti alkaline basalts. The trace elements are characterized by extremely low contents of Rb and Ba, severely depletion in Sr and enrichment in Ta, Ti, Zr, Hf, Th, which is similar to the weak crustal contamination of the Emeishan high-Ti basalt. The chondrite-normalized REE pattern shows LREE enrichment and weak positive Eu anomaly. The Sr-Nd isotopes suggest that meta-basalts in Tabai area of Gejiu are mainly from the primitive mantle and fall in the oceanic island basalts(OIB), which are of the same origin as Emeishan high-Ti basalts. Emeishan mantle plume activity has ended in Late Permian. Therefore, the stretching of Yangtze massif in Triassic and the subduction of Simao massif to Yangtze massif induce Emeishan mantle plume stigma to a low degree of partial melting. Because the influence of mantle plume activity lasts for a long time, the energy of mantle plume activity is low in some areas, the basaltic magma does not erupt to the surface and forms magma chamber. Meta-basalts in Tabai area of Gejiu are formed in the relatively weak stage of the center of mantle plume magma activity, especially in the edge zone of mantle plume activity center, the relatively thick lithosphere, and low melting degree. The magma chamber activity in Late Triassic re-erupts and forms basalt.

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Last Update: 2021-09-30