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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Differential exhumation histories between Qulong and Xiongcun porphyry copper deposits in the Gangdese copper metallogenic Belt: Insights from low temperature thermochronology
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Differential exhumation histories between Qulong and Xiongcun porphyry copper deposits in the Gangdese copper metallogenic Belt: Insights from low temperature thermochronology

机译：古龙和熊村斑岩铜矿之间的差分挖掘历史在甘蓝铜矿化带中的铜矿：低温热量学的见解

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The Qulong and Xiongcun porphyry deposits in the Gangdese Copper (Molybdenum) Metallogenic Belt (GCMB) are both giant porphyry deposits. They were located in the eastern and the central GCMB (about 400 km apart), and were generated in the Miocene and the Jurassic, respectively. In order to reveal why the two asynchronous deposits could occur in the same metallogenic belt, the in-situ zircon U-Pb, zircon and apatite fission track (ZFT and AFT), and apatite (U-Th)/He (AHe) dating were conducted. Their associated exhumation amounts and histories were compared, and finally the prospecting significance was evaluated. AHe ages of the Qulong deposit indicate it underwent an amount of at least 1.3-2.8 km exhumation since 13.8-13.1 Ma. However, AFT data and modeling results reveal that the Xiongcun deposit experienced two stages of rapid cooling at 20-13 Ma and 13-8 Ma, respectively. The temperature decreases from 160 degrees C to 40 degrees C after 20 Ma and the corresponding exhumation amount is about 4-6 km. Integrated the regional thermochronological data, exhumation amounts of 4-6 km and < 2 km in the southern and northern parts of the central Gangdese Magmatic Arc (GMA) and up to 6-8 km in the eastern GMA during 20-13 Ma were assumed, while exhumation amounts of both the eastern and central GMA post-13 Ma were < 2 km, except for north-south rifting zone and river valley. These observations imply that porphyry deposits formed prior to 20 Ma should sparsely preserve, whereas those generated after Early Miocene should preserve well and thus have preservation potential. However, the occurrence of Xiongcun porphyry deposit with intensive exhumation indicates it had been buried by post-mineralization volcano-sedimentary rocks. Therefore, the temporal-spatial distribution of the porphyry deposit in the GCMB is largely controlled by the combination of burial, uplift, and exhumation. The two stages of exhumation in the Xiongcun deposit resemble with those of the entire GCMB. The Early Miocene rapid exhumation might be regulated by Xietongmen-Lhasa-Oiga brittle-ductile shear (XLOBDS), while the Late Miocene rapid exhumation might be associated with incision of Yarlung River.
机译：古龙和雄春春卟啉矿床（Molybdenum）成矿带（GCMB）都是巨大的斑岩沉积物。它们位于东部和中央GCMB（距离约400公里），分别在内科和侏罗纪产生。为了揭示为什么两个异步沉积物可能发生在相同的成矿带中，原位锆石U-PB，锆石和磷灰石裂变轨道（ZFT和AFT），和磷灰石（U-TH）/ HE（AHE）约会进行了。比较了它们相关的挖掘量和历史，最后评估了勘探意义。 Qulong押金的AHE年龄段表明，自13.8-13.1 mA以来，它介绍了至少1.3-2.8 km抛出。然而，AFT数据和建模结果表明，雄村储存分别经历了20-13 mA和13-8 mA的快速冷却的两个阶段。 20mA后，温度从160摄氏度降低至40℃，相应的呼口量约为4-6千米。综合区域热量数据，挖掘量为4-6公里，南部和北部的南部和北部2公里，在20-13 mA期间，东部GMA达​​到了6-8公里除非南北渔罗区和河流山谷外，东部和中央GMA后13米的挖掘量<2公里。这些观察意味着在20 mA之前形成的斑岩沉积物应该稀疏地保护，而早期内茂的那些应该保持良好，因此具有保存潜力。然而，具有密集挖掘的熊春村斑岩矿床的发生表明它被矿产后矿化火山沉积岩埋葬。因此，GCMB中斑岩沉积物的时间空间分布主要受到墓穴，隆起和挖掘的组合来控制。熊猫存款中挖掘的两个阶段类似于整个GCMB的宿率。早期的内肾上腺迅速挖掘可能受到Xietongmen-lhasa-oiga脆性 - 韧性剪切（Xlobds）调节，而后期的内肾上腺迅速挖掘可能与Yarlung River的切口有关。

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