|Table of Contents|

Zircon U-Pb Dating and Geochemical Characteristics of Early Paleozoic Granite in the Southern Sunake of West Kunlun, Northwest China and Their Geological Significances(PDF)

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

Issue:
2020年第04期
Page:
427-441
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Zircon U-Pb Dating and Geochemical Characteristics of Early Paleozoic Granite in the Southern Sunake of West Kunlun, Northwest China and Their Geological Significances
Author(s):
CHEN Gui-min1 LIU Jun-chen23 WANG Yi-tian2* HU Qiao-qing2 HUANG Shi-kang2 SUN Zheng-hao3 Nijiati ABUDUXUN4 KONG De-yi5 LIU Jing-feng5
(1. No.6 Geological Party, Xinjiang Bureau of Geology and Mineral Exploration and Development, Hami 839000, Xinjiang, China; 2. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China; 3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 4. School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China; 5. No.10 Geological Party, Xinjiang Bureau of Geology and Mineral Exploration and Development, Hotan 848000, Xinjiang, China)
Keywords:
granite zircon U-Pb age geochemistry petrogenesis tectonic setting Kuerliang rift zone West Kunlun Xinjiang
PACS:
P588.1; P59
DOI:
10.19814/j.jese.2020.03026
Abstract:
Sunake granite, located in Kuerliang rift zone of West Kunlun orogen, is composed of biotite monzogranite, in which granodiorite dikes are intruded. The LA-ICP-MS dating yields zircon U-Pb ages of(477.0±2.1)Ma and(466.7±2.0)Ma from the biotite monzogranite and granodiorite, respectively, which are the products of tectonic magmatism during Early-Middle Ordovician. The major elements of Sunake biotite monzogranite are characterized by high silica(the contents of SiO2 are 72.75%-76.44%)and alkali(the contents of Na2O+K2O are 8.58%-9.12%)with the A/CNK of 1.02-1.11, showing that they are weakly peraluminous and high-K calc-alkaline series. The chondrite-normalized REE pattern presents a gentle right-leaning and “V” shape with significant negative Eu anomalies. The trace elements are enriched in Rb, K, Th and U, and evidently depleted in Ba, Sr, Eu, P and Ti. Overall, Sunake biotite monzogranite has the geochemical characteristics of high fractionated I-type granite, which is the product of Proto-Tethys Ocean subduction in West Kunlun during Early Paleozoic.

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Last Update: 2020-07-27