喂子坪秦岭杂岩麻粒岩相变沉积岩的变质作用<i>p-T</i>演化及其构造意义-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

喂子坪秦岭杂岩麻粒岩相变沉积岩的变质作用p-T演化及其构造意义

Metamorphic p-T evolution and tectonic implications of granulite-facies meta-sedimentary rocks in the Weiziping from the Qinling Complex

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DOI	10.20086/j.cnki.yskw.2024.0205
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2024, 43(2)
作者	刘学锋，苟龙龙*，田智博，周峰，马椰婷,
作者单位	大陆动力学国家重点实验室, 西北大学地质学系, 陕西西安 710069
摘要	秦岭杂岩位于秦岭造山带北秦岭构造带，是研究秦岭造山带早古生代构造演化的重要岩石构造单元。喂子坪地区发育有典型的秦岭杂岩，其中的混合岩是由变沉积岩经历了强烈的深熔作用形成的。本研究对其进行了岩相学、变质相平衡模拟和LA-ICP-MS锆石U-Pb年代学研究，以深入揭示它们的变质温压演化特征，进而阐明它们指示的构造意义。混合岩的中色体由含石榴子石角闪黑云斜长片麻岩和含石榴子石黑云角闪斜长片麻岩组成。含石榴子石角闪黑云斜长片麻岩只记录了峰期变质矿物组合，为镁铁闪石+石榴子石+斜长石+石英+黑云母+钛铁矿+熔体，而含石榴子石黑云角闪斜长片麻岩记录了3个变质演化阶段，分别是早期进变质阶段（M1）：黑云母+斜长石+石英；峰期变质阶段（M2）：镁铁闪石+石榴子石+斜长石+石英+黑云母+钛铁矿+熔体；退变质阶段（M3）：普通角闪石+斜长石+黑云母+石英+熔体。全岩成分视剖面图模拟计算显示含石榴子石角闪黑云斜长片麻岩和含石榴子石黑云角闪斜长片麻岩压力峰期的变质温压条件分别为790~810℃/990~1 040 MPa和840~862℃/1 000~1 190 MPa。含石榴子石黑云角闪斜长片麻岩3组局部矿物组合域成分视剖面图模拟计算得到压力峰期后变质阶段的温压条件为735~814℃/400~810 MPa、721~794℃/430~700 MPa、740~810℃/470~780 MPa。因此，本研究揭示了喂子坪地区秦岭杂岩片麻岩记录了近等温降压的p-T轨迹。LA-ICP-MS锆石U-Pb定年得到含石榴子石角闪黑云斜长片麻岩和2个浅色体样品中的变质锆石²⁰⁶Pb/²³⁸U加权平均年龄分别为383.2±7.0 Ma、400±3.6 Ma和406.7±7.8 Ma。结合已发表的数据，喂子坪地区变沉积岩麻粒岩相峰期变质作用和强烈的混合岩化作用的时代约为410~390 Ma，而约380 Ma的年龄可能代表退变质冷却到固相线的时代。片麻岩近等温降压的变质演化轨迹指示喂子坪地区秦岭杂岩的变沉积岩在下地壳经历了麻粒岩相变质作用和随后的快速抬升，与碰撞造山引起的地壳增厚和随后的地壳伸展有关。
Abstract	The Qinling Complex is a major tectonic unit in the Northern of the Qinling Orogenic Belt, which is the key to understand the tectonic evolution of the Qinling Orogenic Belt during the early Paleozoic. The migmatites of the Qinling Complex in the Weiziping area, were formed by strong anatexis of meta-sedimentary rocks. In this paper, a combined study of petrology, zircon U-Pb dating and phase equilibrium modeling was carried out on these rocks, in order to better constrain their metamorphic p-T evolution, and tectonic implications. The mesosomes are composed of garnet-bearing hornblende-biotite-plagioclase gneiss, as well as garnet-bearing biotite-hornblende-plagioclase gneiss. The garnet-bearing hornblende-biotite-plagioclase gneiss records only peak mineral assemblage of cummingtonite+garnet+plagioclase+biotite+quartz+ilmenite+melt. However, the garnet-bearing biotite-hornblende-plagioclase gneiss displays three metamorphic mineral assemblages, including biotite+plagioclase+quartz (prograde metamorphic stage, M1), cummingtonite+garnet+plagioclase+biotite+quartz+ilmenite+melt (peak metamorphic stage, M2), and hornblende+biotite+plagioclase+quartz+melt (retrograde metamorphic stage, M3). Phase equilibrium modelling constrained the peak p-T conditions of the garnet-bearing hornblende-biotite-plagioclase gneiss and the garnet-bearing biotite-hornblende-plagioclase gneiss to be 790~810℃/990~1 040 MPa, and 840~862℃/1 000~1 190 MPa, respectively. In addition, the retrograde metamorphic p-T conditions were constrained to be 735~814℃/400~810 MPa, 721~794℃/430~700 MPa, and 740~810℃/470~780 MPa, using p-T pseudosections calculated with local effective composition, for the garnet-bearing biotite-hornblende-plagioclase gneiss. As a result, the meta-sedimentary rocks from the Qinling Complex in the Weiziping area underwent a nearly isothermal decompression p-T path. LA-ICP-MS zircon U-Pb analyses obtain the weighted mean ²⁰⁶Pb/²³⁸U ages of 383.2±7.0 Ma, 400±3.6 Ma, and 406.7±7.8 Ma for metamorphic zircons from garnet-bearing hornblende-biotite-plagioclase gneiss and two leucosome samples, respectively. Integrated with previously published data, the timing of peak metamorphism and strong migmatization of the meta-sedimentary rocks in the Weiziping area is constrained to be ca. 410~390 Ma, whereas the age of ca. 380 Ma may represent the timing of retrograde cooling to the solidus. The nearly isothermal decompression path indicates that the granulite-facies meta-sedimentary rocks in the Weiziping area underwent rapid exhumation, which is interpreted to be resulted from the crustal thickening associated with continental collision and subsequent extension.
关键词	秦岭造山带；秦岭杂岩；深熔作用；相平衡模拟；近等温降压p-T轨迹
KeyWord	Qinling Orogenic Belt; Qinling Complex; anatexis; phase equilibrium modelling; ITD p-T path
基金项目
页码	274-303

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刘学锋，苟龙龙*，田智博，周峰，马椰婷. 喂子坪秦岭杂岩麻粒岩相变沉积岩的变质作用p-T演化及其构造意义 [J]. 岩石矿物学杂志. 2024; 43; (2). 274 - 303.

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