Zircon U-Pb ages and geochemical characteristics of diabase in Nie'erco area, central Tibet: Implication for Neo-Tethyan slab breakoff
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摘要:
研究目的 幔源岩浆活动是探讨深部动力学演化的理想研究对象，西藏中部聂尔错地区广泛发育的基性岩脉无疑是探讨区域构造-岩浆演化的关键所在。
研究方法 本文对聂尔错辉绿岩脉进行了系统的岩石学、地质年代学和地球化学综合研究。
研究结果 分析结果表明，聂尔错辉绿岩锆石U-Pb定年结果为（50.8±0.6）Ma，为始新世早期岩浆活动的产物。全岩地球化学组成显示辉绿岩具有低SiO2、高MgO、Al2O3、TiO2和全碱含量（Na2O+K2O），富集轻稀土元素、亏损重稀土元素等特征，显示碱性洋岛型玄武岩（OIB）的地球化学特征。地球化学特征指示辉绿岩可能起源于软流圈地幔，同时岩浆在上升过程中受到一定程度的地壳物质混染。
结论 结合西藏南部地区广泛发育的同时期碰撞后林子宗火山岩与OIB型基性岩，研究认为西藏地区新生代岩浆活动主要受控于新特提斯洋的北向俯冲以及印度-欧亚板块的碰撞过程，板片断离所导致的上涌软流圈地幔减压熔融是聂尔错辉绿岩最为合理的成因解释。
Abstract:This paper is the result of geological survey engineering.
Objective Mantle-derived magmatism generally provided an ideal research object to reveal the geodynamic evolution in the depth. The mafic dikes, which shown intensive distribution in Nie'erco area of central Tibet, are regarded as a key aspect to understanding the regional tectono-magmatic evolution.
Methods In this paper, we report geochronological and geochemical data of the diabases in the Nie'erco area.
Results The zircon U-Pb dating yielded magmatic crystallization ages of (50.8 ±0.6) Ma, indicating the Nie'erco diabases emplacement in the early Eocene. The diabase samples have low SiO2, high MgO, Al2O3, TiO2 and total alkali (Na2O+K2O) contents, similar to alkaline ocean island basalt (OIB). These geochemical features suggest that the studied diabases were generated by partial melting of asthenosphere, with the involvement of continental crustal components.
Conclusions Combined with the post-collisional Linzizong volcanic rocks and OIB-like mafic rocks in southern Tibet, we prefer that the Cenozoic magmatism in Tibet is mainly controlled by the northward subduction of the Neo-Tethyan ocean and the following continent collision between India and Eurasia plates. Our research favor that the Nie'erco diabases were generated in response to the slab breakoff and related upwelling and decompressional melting of sub-slab asthenosphere.
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Key words:
- zircon U-Pb age /
- diabase /
- Eocene /
- Neo-Tethys /
- slab breakoff /
- geological survey engineering /
- Nie'erco /
- Tibet
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图 4 Nb/Y-Zr/TiO2图解（a，据Pearce, 1996）和SiO2-(Na2O+K2O)图解（b）（数据引自D'Orazio et al., 2001; Gorring et al., 2003; Espinoza et al., 2005; Ji et al., 2016; Wu et al., 2019a）
Figure 4.
图 5 球粒陨石标准化稀土元素模式图（a）和原始地幔标准化微量元素蛛网图（b）（OIB、E-MORB、N-MORB的平均值与微量元素的标准化值引自Sun and McDonough（1989），其他数据引用同图 4）
Figure 5.
图 6 (La/Nb)N-(Th/Nb)N图解（a, 据Frey et al., 2002）和Nb/U-Nd/Pb图解（b, 据Ji et al., 2016）（引用数据同图 4）
Figure 6.
图 7 Ti-V图解（a, 据Shervais, 1982）和TiO2-MnO-P2O5图解（b, 据Mullen, 1983）（引用数据同图 4）
Figure 7.
图 8 Zr-Zr/Y图解（a, 据Pearce and Norry, 1979）和Nb×2-Zr/4-Y图解（b, 据Meschede, 1986）（引用数据同图 4）
Figure 8.
表 1 聂尔错辉绿岩LA-ICP-MS锆石U-Pb定年结果
Table 1. LA-ICP-MS zircon U-Pb dating results of Nie'erco diabases
下载: 导出CSV
表 2 聂尔错辉绿岩主量元素（%）和微量元素（10-6）分析结果
Table 2. Analytical results of major (%) and trace elements（10-6）of Nie'erco diabases
下载: 导出CSV
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