Geochronology, Geochemistry and Petrogenesis of Late Jurassic Granitoids in Shiquanhe Area, Western Lhasa Block, Tibet
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摘要: 目前关于拉萨地块西段狮泉河地区中生代岩浆岩的报道相对较少，限制了对该地区中生代岩浆作用的认识.对狮泉河地区石英闪长岩和闪长质包体的锆石U-Pb年龄、岩石学特征与元素地球化学进行了研究.结果显示，寄主石英闪长岩的年龄为161.1±1.7 Ma，闪长质包体的年龄为159.8±1.6 Ma和157.0±1.3 Ma，两者为同期形成.寄主石英闪长岩为I型准铝质中钾-高钾钙碱性系列岩石，具有富集大离子亲石元素、亏损高场强元素的特征.闪长质包体为准铝质中钾-高钾钙碱性系列岩石.岩石学、地球化学特征研究表明，该套岩石可能与中侏罗世班公湖-怒江特提斯洋南向俯冲有关，班公湖-怒江特提斯洋南向俯冲引起幔源物质发生熔融，上涌的幔源岩浆与拉萨地块古老基底重熔形成的酸性岩浆混合，形成了含闪长质包体的晚侏罗世岩体.Abstract: There are relatively few reports on the Mesozoic magmatic rocks in the Shiquanhe area of western Lhasa Block, which limits the understanding of the Mesozoic magmatism in this area. In this paper, it presents the major element, trace element and zircon U-Pb age data of bulk-rock for the host quartz diorite and dioritic enclaves from the Shiquanhe area. The zircon dating yields U-Pb age of 161.1±1.7 Ma for the host quartz diorite, of 159.8±1.6 Ma and 157.0±1.3 Ma respectively for dioritic enclaves, indicating that the host quartz diorite and dioritic enclaves have similar crystallization ages and they both formed at Late Jurassic. The host quartz diorite is metaluminous and calc-alkaline to high K calc-alkaline I-type granitoids. They are enriched in large ion lithopile elements, and depleted in high field strength elements. The dioritic enclaves are metaluminous and calc-alkaline to high K calc-alkaline. Based on the data in this study and previous ones, it is proposed that Late Jurassic quartz diorite was formed in tectonic setting of the southward subduction of Bangongco-Nujiang Neo-Tethyan oceanic seafloor, and generated by the magma mixing between mantle-derived basic magma and acidic magma formed by the melting of the ancient crustal material of Lhasa Block.
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Key words:
- Late Jurassic /
- quartz diorite /
- dioritic enclave /
- zircon U-Pb age /
- Shiquanhe area /
- geochemistry /
- geochronology
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图 1 青藏高原南部构造单元划分（a）及研究区地质简图（b）
底图据李勇等（2018）修改. SXG.狮泉河-许如错-工布江达断裂；THS.吉隆-定日-岗巴-错那断裂
Fig. 1. Tectonic framework of southern Tibetan Plateau (a) and simplified geological map of Shiquanhe area (b)
图 2 狮泉河地区样品野外（a）及镜下（b~d）照片
Q.石英；Pl.斜长石；Hb.角闪石；Bt.黑云母；Ap.磷灰石
Fig. 2. Field outcrop image (a) and micrographs (b－d) of Shiquanhe granitoid samples
图 3 石英闪长岩和闪长质包体样品的锆石阴极发光图像、测点及年龄
Fig. 3. CL images, analyzed spots and ages of zircons from quartz diorite and dioritic enclaves
图 4 锆石U-Pb谐和图及加权平均年龄
Fig. 4. Zircon U-Pb concordia diagrams and weighted mean age of samples
图 5 狮泉河地区侵入岩TAS（a）、SiO2-K2O（b）和A/NK-A/CNK（c）图解
Fig. 5. TAS (a), SiO2-K2O (b) and A/NK-A/CNK (c) diagrams of the Shiquanhe intrusive rocks
图 6 狮泉河地区岩石样品的球粒陨石标准化稀土元素配分图（a）和原始地幔标准化微量元素蛛网图（b）
Fig. 6. Chondrite-normalized REE pattern (a) and primitive mantle normalized trace element spider diagram (b) for the Shiquanhe granitoid samples
图 7 狮泉河地区寄主石英闪长岩与闪长质包体哈克图解
Fig. 7. Harker diagrams of quartz diorite and dioritic enclaves in the Shiquanhe area
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