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胶东地区燕山期岩浆活动及其构造环境——来自单颗锆石SHRIMP年代学的记录

发布时间:2018-03-27 09:46

  本文选题:中生代岩浆作用 切入点:格架 出处:《地质学报》2017年01期


【摘要】:山东胶东地区中生代构造-岩浆事件和金矿成矿作用密切相关,其主要构造-岩浆事件包括:1220~200 Ma,扬子板块相对华北板块的南北向碰撞形成苏鲁高压-超高压变质带及同造山花岗岩与造山后高碱正长岩,属于典型的幔源型花岗岩系列;2 165~150 Ma,晚侏罗世时期形成与金矿有关的玲珑(昆嵛山)造山早期片麻状二长花岗岩组合,为过铝质花岗岩类,属胶东基底岩系的部分重熔产物。3 135~110 Ma,由壳幔混合岩浆结晶分异形成郭家岭花岗岩和伟德山花岗闪长岩。燕山期是胶东地区岩浆活动的鼎盛时期,表现为四次强烈的构造-岩浆事件,代表了燕山造山事件四个构造幕,并以挤压与伸展相互转化为特征。研究表明胶东地区中生代花岗岩具有继承性和再生性特点,采自郭家岭花岗闪长岩中的SHRIMP锆石U-Pb同位素年代学测定结果表明:锆石由核部到边部年龄值分别为2573~2194Ma、164.8~147.8和126.6~126.2Ma,显示了胶东结晶基底、玲珑花岗岩和郭家岭花岗岩形成的年代学信息,揭示了它们之间复杂的继承性和再生性,即新太古代胶东岩群、TTG岩系和古元古代荆山群、粉子山群等胶东基底岩系交代重熔形成S型玲珑花岗岩,由壳幔混合岩浆形成的郭家岭花岗岩在形成与侵位过程中重熔交代了部分玲珑花岗岩物质并侵位于玲珑花岗岩中。分析认为2573.4~2194.4 Ma是胶东结晶基底的年龄信息,164.8~147.8Ma代表了玲珑花岗岩形成的年龄信息,126.2~126.6Ma则代表了郭家岭花岗岩形成的年龄信息。这种年龄信息组合也反映了胶东地区从新太古代陆块形成、古元古代克拉通化到三叠纪华北陆块与扬子陆块碰撞至玲珑S型花岗岩形成、郭家岭壳幔混合型花岗岩形成演化的年代学记录,浓缩了胶东地区中生代岩浆起源和演化的过程,进而为诠释胶东地区深部岩浆作用过程提供了新的资料,并对后续的相关科学研究尤其是金矿的多期成矿作用提供了佐证。
[Abstract]:Mesozoic tectonic-magmatic events are closely related to gold mineralization in Shandong Jiaodong area. The main tectonic-magmatic events include: 1220m 200 Ma.The Yangtze plate collided with the North China plate to form the Sulu high-pressure high-pressure metamorphic belt and synorogenic granite and post-orogenic high-alkali syenite. It belongs to a typical mantle-derived granitoid series of 2165U 150 Ma.The Linglong (Kunyu) orogenic early orogenic granitic granitic assemblage was formed during the late Jurassic, which is peraluminous granitic. Part of the remelting product of the Jiaodong basement rock series was 3.135 ~ (10) Ma, which formed the Guojialing granite and the Weideshan granodiorite from the crystallization differentiation of the crust and mantle mixed magma. The Yanshanian period was the peak of magmatic activity in the Jiaodong area, the Yanshanian period was the peak of magmatic activity in Jiaodong area. Four strong tectonic-magmatic events, representing the four tectonic episodes of Yanshanian orogenic event and characterized by the mutual transformation of compressions and extensions, show that the Mesozoic granites in Jiaodong area are inherited and regenerated. The SHRIMP zircon dating from the granodiorite of Guojialing shows that the ages of zircon from the core to the edge are 2573 ~ 2194 Ma ~ 164.8 ~ 147.8 and 126.6 ~ 126.2 Ma, respectively, indicating the geochronological information of the crystalline basement, Linglong granite and Guojialing granite in Jiaodong. It is revealed that the complex inheritance and regeneration between them, that is, the TTG rock series of NeoArchean Jiaodong rock group and the Jingshan Group of Paleoproterozoic, the metasomatic remelting of the strata of Jiaodong basement, such as the Fangzishan Group, formed S-type Linglong granite. The Guojialing granite formed by the mixed magma of crust and mantle remelted part of the Linglong granite material during the formation and emplacement process and was located in the Linglong granite. It is considered that 2573.4. 4 and 2194.4 Ma is the age information of Jiaodong crystalline basement of 164.8147.8 Ma. The age information of Linglong granite is 126.2and 126.6 Ma, which represents the age information of Guojialing granite formation. This age information combination also reflects the formation of NeoArchean continental blocks in Jiaodong area. Paleoproterozoic cratonization to Triassic collision of North China block and Yangtze block to the formation of Linglong S-type granite, and the chronological record of formation and evolution of Guojialing crust-mantle mixed type granite, have concentrated the process of origin and evolution of Mesozoic magma in Jiaodong area. It provides new data for the interpretation of the deep magmatism process in Jiaodong area, and provides evidence for the subsequent scientific research, especially for the multi-stage mineralization of gold deposits.
【作者单位】: 山东省地质科学研究院国土资源部金矿成矿地质过程与资源利用重点实验室山东省金属矿产成矿地质过程与资源利用重点实验室;
【基金】:山东省招远-莱州地区金矿成矿地质条件及成矿规律研究(2012028) 山东省泰山学者建设工程专项经费联合资助
【分类号】:P597.3;P588.1;P618.51

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