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经1/5万区调填图,作者在东秦岭造山带夹持于竹林关-青山断裂带和山阳-豆腐尖断裂带之间的原划“九里坪组”地层中解体出了一系列规模不大的钠长岩体。通过野外宏观调查和室内测试分析,对这些钠长岩的产状、地质背景、岩石化学和地球化学特征进行了综合研究。提出了这些钠长岩是由深部钠质熔浆沿断裂带上侵到地壳浅部发生侵入-交代作用而形成的观点。其成因模式为:侵入-隐爆-充填交代。这与前人在研究西秦岭造山带钠长岩时所提出的热水沉积成因模式明显不同。另外,还从这些钠长岩体中首次获得全岩铷-锶等时线年龄为3649±109Ma的资料。对研究整个秦岭造山带钠质流体热事件具有十分重要的意义。
After 1/50000 mapping, the author disintegrated from the original “Jiuliping Formation” strata in the East Qinling orogenic belt between the Zhulinguan-Qingshan fault zone and the Sanyang-Tofu sharp fault zone Alluvial small rock body. Through the field macro-investigation and laboratory test analysis, the production, geological background, petrochemistry and geochemistry characteristics of these albite rocks are comprehensively studied. It is proposed that these albite rocks are formed by the intrusion of the deep sodium-bearing molten mud into the shallow crust along the fault zone. The cause of formation is: intrusion - hidden explosion - filled account. This is obviously different from the genesis pattern of hydrothermal sediments proposed by the predecessors in the study of albite in the West Qinling orogenic belt. In addition, the data of the whole rock rubidium-strontium isochron age of 364.9 ± 10.9 Ma were also obtained from these albite bodies for the first time. It is of great significance to study the thermal events of sodium-bearing fluid in the whole Qinling orogenic belt.