Metallogenic Chronology and Prospecting Indication of Tiechanghe Granite and Polymetallic Molybdenum Mineralization Types in Jiulong Area, Western Sichuan, China

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-09-05 DOI:10.3390/min14090909
Shuang Yang, Hongqi Tan, Zhongquan Li, Junliang Hu, Xinyan Wang, Daming Liu
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Abstract

The Songpan–Ganzi Orogenic Belt (SGOB) is bounded by the South China, North China, and Qiangtang blocks and forms the eastern margin of the Tibetan Plateau. The Tiechanghe Granite is located at the junction of the southeast margin of the SGOB and the western margin of the Yangtze Block. To elucidate the genetic relationship between the Tiechanghe Granite and the surrounding molybdenum deposits in Western Sichuan, in this study, we conducted zircon U-Pb and molybdenite Re-Os isotopic dating. The results indicate that the Tiechanghe Granite predominantly consists of monzogranite, with minor occurrences of syenogranite, while the molybdenum deposits are mainly found in skarn and quartz veins. The laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb ages of the Tiechanghe Granite range from 162.9 ± 0.7 Ma (MSWD = 0.31, n = 25) to 163.4 ± 0.6 Ma (MSWD = 0.85, n = 26), and the LA-ICP-MS zircon U-Pb age of the pegmatite veins is 164.1 ± 0.9 Ma (MSWD = 1.3, n = 19). These ages are consistent with the weighted average Re-Os age of the Ziershi molybdenite (160.3 ± 1.6 Ma, n = 2) within the error margins. These findings and previously obtained magmatic and metallogenic ages for the region suggest that a magmatic and mineralization event involving granite, molybdenum, tungsten, and copper occurred at around 162–164 Ma in the study area. This discovery broadens the exploration perspective for mineral resources in the Jiulong area of Western Sichuan and the entirety of Western Sichuan.
中国四川西部九龙地区铁厂河花岗岩及多金属钼矿化类型的成矿年代及找矿指示
松潘-甘孜造山带(SGOB)以华南块体、华北块体和羌塘块体为界,构成青藏高原的东缘。铁厂河花岗岩位于SGOB东南缘与扬子地块西缘的交界处。为阐明铁厂河花岗岩与川西周边钼矿床的成因关系,本研究对铁厂河花岗岩进行了锆石U-Pb和辉钼矿Re-Os同位素定年。研究结果表明,铁厂河花岗岩主要由单斜花岗岩组成,也有少量的正长花岗岩,而钼矿床主要分布在矽卡岩和石英脉中。铁厂河花岗岩的激光烧蚀电感耦合等离子体质谱(LA-ICP-MS)锆石 U-Pb 年龄为 162.9 ± 0.7 Ma(MSWD = 0.31,n = 25)至 163.4 ± 0.6 Ma(MSWD = 0.85,n = 26),伟晶岩脉的 LA-ICP-MS 锆石 U-Pb 年龄为 164.1 ± 0.9 Ma(MSWD = 1.3,n = 19)。这些年龄与紫金山辉钼矿的加权平均Re-Os年龄(160.3 ± 1.6 Ma,n = 2)在误差范围内一致。这些发现以及之前获得的该地区的岩浆和成矿年龄表明,在研究区域大约 162-164 Ma 发生了涉及花岗岩、钼、钨和铜的岩浆和成矿事件。这一发现拓宽了四川西部九龙地区乃至整个四川西部矿产资源的勘探前景。
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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