|Table of Contents|

Chronology and Geochemical Characteristics of Granitoids in Pantiange Area, the Western Yunnan, China and Their Geological Significance(PDF)

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

Issue:
2023年第01期
Page:
1-26
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Chronology and Geochemical Characteristics of Granitoids in Pantiange Area, the Western Yunnan, China and Their Geological Significance
Author(s):
WANG Qiu-yu12 LI Sai-sai12* ZHANG Hong-rui3** XIN Liang-wei12 WU Jiang-bo12
(1. Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources by the Province and Ministry, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. College of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China; 3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)
Keywords:
granitoids geochemistry zircon U-Pb age Sr-Nd isotope Hf isotope Middle Triassic Sanjiang orogen Paleo-Tethys
PACS:
P588.12; P597
DOI:
10.19814/j.jese.2022.10026
Abstract:
The tectonic setting of Jiangda-Weixi magmatic belt is still controversy. Two different interpretations include the eastward subduction of Longmucuo-Shuanghu-Changning-Menglian Paleo-Tethys main ocean basin, and the westward subduction and subsequent collision of Jinshajiang Paleo-Tethys main ocean basin. These controversies concern different models for tectonic evolution of Paleo-Tethys. A new set of intrusive complex has been discovered in Pantiange area, the southern part of Jiangda-Weixi magmatic belt. The main components include dioritic, granodioritic and granitic rocks, which have been mylonitized. The zircons from granitic rocks have U-Pb mean age of(243.0±4.8)Ma. The age is considered as crystallization age of granitic rocks. Dioritic rocks have high contents of Na2O and Al2O3, and moderate content of K2O, suggesting they belong to metaluminous and calc-alkaline series. Granodioritic rocks has high contents of K2O and Al2O3, but low content of Na2O, suggesting they belong to peraluminous and shoshonite, high potassium calc-alkaline series. Granitic rocks have moderate content of Na2O and low content of K2O, and belong to metaluminous-peraluminous and low-potassium series. All three types of rocks are enriched in LILEs(such as Rb, Th, U), depleted in HFSEs(such as Nb, Ta, P, Ti)and LILEs(such as Ba, Sr), with high values of LREE/HREE ratio. The dioritic rocks have no obvious Eu anomaly, whereas granodioritic and granitic rocks show weak negative Eu anomaly. The granitic rocks have zircon εHf(t)values of -11.92--8.54, whole rocks initial 87Sr/86Sr ratio of 0.717 229-0.725 994, and εNd(t)values of -14.2--7.8. These characteristics show that dioritic magmatism is formed by partial melting of Paleoproterozoic basaltic lower crust; granodioritic magmatism is formed by partial melting of metamorphic mudstones of Paleoproterozoic upper crust with the addition of mantle material; granitic magmatism originates from partial melting of metamorphic graywacke in Paleoproterozoic upper crust, and then underground crystallization fractionation with the addition of mantle material. Combined with regional tectonic setting and petrogeochemical characteristics, it is proposed that Jiangda-Weixi magmatic belt is formed by the eastwards subduction of Paleo-Tethys.

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