ZIRCON U-Pb DATING OF PEGMATITE FROM XINGZI METAMORPHIC CORE COMPLEX OF LUSHAN MOUNTAIN AND ITS GEOLOGICAL IMPLICATION
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摘要: 赣北庐山地区出露的“星子变质核杂岩”是中国东南部迄今为止发现的较为典型的科迪勒拉型变质核杂岩之一.该变质核杂岩核部见有大量的, 与拆离断层同时形成并侵入于构造弱带的伟晶岩脉.通过锆石U-Pb法定年, 获得伟晶岩的年龄为(127±2)Ma, 该年龄代表了庐山“星子变质核杂岩”的隆升年龄, 并得到其他地质证据的支持.还讨论了形成变质核杂岩的岩石圈伸展作用与同时期中国东南部大规模岩浆活动的时空关系及其可能的联系.Abstract: Xingzi metamorphic core complex" exposed in the Lushan mountain of northern Jiangxi Province is a typical Cordilleran-type metamorphic core complex so far discovered in southeastern China. Numerous pegmatites intruded in the structural weak zone were present in the core of "Xingzi metamorphic core complex", which is contemporaneous with the detachment fault. Zircon U-Pb dating age of the pegmatite is 130 Ma, representing the uplift age of the complex, which is supported by other geological evidences. The possible spatial and temporal links, furthermore, between the complex formation and contemporary extensive Late Mesozoic magmatism in southeastern China are discussed in this paper.
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Key words:
- uplift age /
- Xingzi metamorphic core complex /
- pegmatite /
- Lushan mountain
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图 1 庐山“星子变质核杂岩”地质简图
Pt1.古元古代星子群片岩夹斜长角闪岩; Pt2.中元古代双桥山群浅变质岩; Pt3.新元古代火山-沉积岩系; Z—Pz.震旦系—古生界; Q.第四系; 1.片麻状含绿帘石角闪黑云花岗岩; 2.中生代花岗岩; 3.伟晶岩脉; 4.拆离断层及糜棱岩带; 5.拉伸线理及产状; 6.片理及片麻理产状; 7.采样点位置及编号
Fig. 1. Sketch map of Xingzi metamorphic core complex
图 2 庐山“星子变质核杂岩”中伟晶岩锆石U-Pb法测年谐和图
Fig. 2. Zircon U-Pb concordia diagram of pegmatite from Xingzi metamorphic core complex of Lushan mountain
表 1 庐山“星子变质核杂岩”中伟晶岩的单颗粒锆石U-Pb法同位素分析结果
Table 1. Single zircon U-Pb analyses of pegmatite from Xingzi metamophic core complex of Lushan mountain
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