A geochronological and geochemical study on the granodiorite porphyry and its implication for the mineralization in the Dayaoshan metallogenic belt,Southeastern China

作     者：Panfeng Liu Jiali Zhang Zhiqiang Wu Qingwei Zhang Meilan Wen Xianrong Luo Chaojie Zheng Wenbin Huang Panfeng Liu;Jiali Zhang;Zhiqiang Wu;Qingwei Zhang;Meilan Wen;Xianrong Luo;Chaojie Zheng;Wenbin Huang

作者机构：College of Earth ScienceGuilin University of TechnologyGuilin 541006China College of Environmental Science and EngineeringGuilin University of TechnologyGuilin 541006China 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2021年第40卷第1期

页      面：106-122页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Key R&D Program of China(2016YFC0600603) the Guangxi Science Foundation(2014GXNSFBA118230) the Foundation of Guilin University of Technology(GUTQDJJ2019166) 

主　　题：U–Pb zircon geochronology Lithogeochemistry Sr–Nd isotopes Granodiorite porphyry The Dayaoshan metallogenic belt 

摘      要：A systematic study combining U-Pb zircon dating,lithogeochemical and Sr-Nd isotopic analyses was carried out upon the Xinping granodiorite porphyry in the Dayaoshan metallogenic belt to understand its petrogenesis and tectonic ***-ICP-MS U-Pb zircon dating yielded a 442.7±5.8 Ma age,indicating that the granodiorite porphyry was emplaced during the Llandovery Silurian of the Early *** granodiorite porphyry shares the same geochemical characteristics such as Eu negative anomaly as other syn-tectonic granite plutons in the region,including the granodiorite porphyry in Dawangding and granite porphyries in the Dali Cu-Mo deposit and Longtoushang old deposit,indicating a similar magma evolution *** Xinping granodiorite porphyry has high contents of SiO2(67.871.8%)and K2O(1.78-3.42%)and is metaluminous-peraluminous with A/CNK ratios ranging from 0.97 to 1.06,indicative of high-potassium calc-alkaline to calc-alkaline *** is a I-type granite enriched in large ion lithophile elements Rb,Sr,while depleted in Ba and high field-strength element ***,a collision between the Yunkai Block from the south and the Guangxi Yunnan-North Vietnam Block from the north during the Early Paleozoic was followed by uplifting of the Dayaoshan *** Xinping granodiorite porphyry was likely emplaced during the ***-Nd isotopic analyses show that the granodiorite porphyry has initial 87Sr/86Sr ratios(Isr)of 0.7080-0.7104,εNd(t)range from-0.08 to-4.09,and t2DM between 1.19 and 1.51 Ga,well within the north-east low-value zone of the Cathaysia block,indicating a Paleoproterozoic Cathaysia basement source and an involvement of under plating mantle *** observations,geochronological data,and 3D spatial distribution all lead to the conclusion that the Early Paleozoic Xinping granodiorite porphyry does not have any metallogenic and temporal relationships with the Xinping gold deposit(which has a Jurassic-Early Cretaceous age based on