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Geochemistry and Geochronology of Intermediate Rocks in the Jiangshan Au Deposit in the Bengbu Uplift, North Anhui Province: Clues to Regional Au Mineralization
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2020-12-08 , DOI: 10.1111/1755-6724.14607
Ke SHI 1, 2, 3 , Xiaoyong YANG 1 , Jianguo DU 2, 3 , Yang CAI 2, 3 , Qiu WAN 2, 3 , Xainjue HUANG 4 , Mingan WU 5
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The Jiangshan gold deposit is the largest, most recently‐discovered gold deposit in the Bengbu Uplift. The ore bodies are located in the structural fracture zone of the Zhuangzili Formation (Ar3), with major Pb‐Zn and Au reserves. In this study, LA‐ICP‐MS zircon U‐Pb analyses yielded a crystallization age of 111.5 ± 1.8 Ma for the quartz diorite porphyry in Jiangshan. The quartz diorite porphyry has high Ba and Sr content, with low Y and Yb content, which is similar to the characteristics of adakitic rocks. They are enriched in large ion lithophile elements (LILEs, e.g., Ba, U) and light rare earth elements (LREEs), while depleted in high field strength elements (HFSEs, e.g., Nb, Ti) and heavy rare earth element (HREEs). They have zircon Hf(t) values of –23.52 to –21.14 (mean = –22.32). and Hf model ages of 2419.76 to 2569.39 Ma. The magma source area is the lower crust. Magma primarily came from the partial melting of the lower crust, with the addition of some mantle material. The quartz diorite porphyries are characterized by high zircon TTi‐in‐zircon values (608–757°C), Ce4+/Ce3+ ratios (71.97–1387.10) and Eu/Eu∗ ratios (0.46–1.08), indicating high temperature and magmatic oxygen fugacities. High temperatures can provide heat to fluids and highly oxidized magmas can control the behavior and speciation of sulfides, thus controlling the behavior of Au. Finally, the ore‐forming fluid is enriched and precipitated in a favorable structural space to form the Jiangshan Au deposit.

中文翻译:

皖北蚌埠隆起江山金矿床中岩的地球化学和年代学:区域金矿化的线索

江山金矿是蚌埠隆起地区最大的,最近发现的金矿。矿体位于庄子里组(Ar 3)的构造断裂带,主要有铅锌和金储量。在这项研究中,LA-ICP-MS锆石U-Pb分析得出江山石英闪长斑岩的结晶年龄为111.5±1.8 Ma。石英闪长岩斑岩具有较高的Ba和Sr含量,具有较低的Y和Yb含量,这与adakitic岩石的特征相似。它们富含大型离子亲石元素(LILE,例如Ba,U)和轻稀土元素(LREE),而富含高场强元素(HFSE,例如Nb,Ti)和重稀土元素(HREE) 。他们有锆石Hft)的值范围为–23.52至–21.14(平均值= –22.32)。和Hf模型年龄为2419.76至2569.39 Ma。岩浆源区是下地壳。岩浆主要来自下地壳的部分熔融,加上一些地幔物质。石英闪长斑岩的特征是锆石T Ti-in- zircon值高(608–757°C),Ce 4+ / Ce 3+比(71.97-1387.10)和Eu / Eu ∗比(0.46-1.08),表明高温和岩浆中的氧气逸出。高温可以为流体提供热量,而高度氧化的岩浆可以控制硫化物的行为和形态,从而控制金的行为。最后,成矿流体在有利的构造空间内富集并沉淀,形成了江山金矿床。
更新日期:2020-12-29
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