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Petrogenesis of Early Carboniferous High-Mg Andesite and Its Tectonic Significance in the Southern Tectonic Belt of Yining Block, China(PDF)

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

Issue:
2022年第03期
Page:
466-480
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Petrogenesis of Early Carboniferous High-Mg Andesite and Its Tectonic Significance in the Southern Tectonic Belt of Yining Block, China
Author(s):
WANG Zuo-peng1;  LI Yong-jun2;  YANG Gao-xue2;  LI Gan-yu3;  LI Hai4
(1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 2. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 3. Teaching Development Center, Hebei GEO University, Shijiazhuang 050031, Hebei, China; 4. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, Shaanxi, China)
Keywords:
high-Mg andesite;  geochemistry;  petrogenesis;  tectonic setting;  Dahalajunshan Formation;  Early Carboniferous;  South Tianshan ocean;  Yining block
PACS:
P588.12; P595
DOI:
10.19814/j.jese.2022.01027
Abstract:
A large volume of Late Devonian-Early Carboniferous magmatic rocks are exposed in the southern tectonic belt of Yining block, and their formation is closely related to the evolution of South Tianshan ocean. However, the petrogenesis and tectonic setting of these rocks remain poorly understood. High-Mg andesite in the volcanic rocks of Lower Carboniferous Dahalajunshan Formation in Kekesu Linchang area, the southern tectonic belt of Yining block was discovered. Detailed field geological survey and indoor analysis were carried out for the high-Mg andesite, and the tectonic setting during this period was discussed. The rock types of Dahalajunshan Formation in the research area are dominated by andesites with minor of basalts and pyroclastic rocks. Whole-rock major elements show that the high-Mg andesite samples are characterized by high SiO2, TiO2, Al2O3, and MgO, coupled with low P2O5 and Rittman index, displaying the features of medium-high potassium calc-alkaline series rocks; the contents of REE in these samples vary widely with high(La/Yb)N,(La/Sm)N and(Gd/Yb)N values, showing significant enrichment of LREE. Additionally, it is enriched in LILE, such as K, Ba, Th, U, and Pb, but relatively depleted in HFSE including Nb, Ta, Ti, and P, as well as negative Eu anomaly. Meanwhile, the samples contain high Sr and Y contents, and low Ni content, with low Sr/Y and La/Yb values, which are similar to the geochemical characteristics of sanukitic high-Mg andesite. Combined with regional data, it is argued that the sanukitic high-Mg andesite in the research area originates from the equilibrium reaction between the mantle wedge and the subduction zone materials, which may result from the subduction of South Tianshan ocean under the southern tectonic belt of Yining block from Late Devonian to Early Carboniferous. The discovery of high-Mg andesite not only enriches the rock types in this area, but also provides an important reference for solving the controversy on regional tectonic evolution.

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