扬子克拉通古元古代冷俯冲低温-高压榴辉岩相变泥质岩的发现及其大地构造意义

韩庆森; 彭松柏; 焦淑娟

doi:10.3799/dqkx.2020.074

扬子克拉通古元古代冷俯冲低温-高压榴辉岩相变泥质岩的发现及其大地构造意义

doi: 10.3799/dqkx.2020.074

韩庆森^{1, 2, ,},
彭松柏^1, ,,
焦淑娟³

1.
中国地质大学地球科学学院, 湖北省流域关键带演化重点实验室, 湖北武汉 430074
2.
中国地质大学地球物理与空间信息学院, 湖北武汉 430074
3.
中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029

基金项目:

国家自然基金项目 41772229

中国博士后科学基金项目 2018M630887

中央高校专项基金“长江中下游地区重大地质过程及资源效应”项目 CUGCJ1708

详细信息

作者简介:
韩庆森(1990-), 男, 在站博士后, 主要从事前寒武纪造山带蛇绿混杂岩、变质岩石学研究

通讯作者:
彭松柏

中图分类号: P58
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出版历程
- 收稿日期: 2020-01-11
- 刊出日期: 2020-06-15

Discovery and Tectonic Implications of Paleoproterozoic Cold Subduction Low-Temperature/High-Pressure Eclogitic Metapelites, Yangtze Craton

Han Qingsen^{1, 2
,
,},
Peng Songbai^{1
, ,},
Jiao Shujuan³

1.
Hubei Key Laboratory of Critical Zone Evolution, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Institute of Geophysics&Geomatics, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

摘要

摘要: 首次报道了扬子克拉通黄陵穹隆北部崆岭杂岩古元古代水月寺混杂岩带中发现特征性石榴石-蓝晶石-硬绿泥石组合低温-高压（LT-HP）榴辉岩相变泥质岩，其变质峰期矿物组合为石榴石+蓝晶石+硬绿泥石+多硅白云母+金红石+石英.相平衡模拟计算得到一条近等温减压的顺时针型变质P-T轨迹，其峰期变质条件为571~576℃，19.2~21.8 kbar.LA-ICP-MS锆石U-Pb年代学研究获得变泥质岩中碎屑锆石核部年龄集中于2.1~2.2 Ga，变质增生边年龄为1 991±20 Ma.Grt-Ky-Cld组合榴辉岩相变泥质岩原岩形成构造环境和变质峰期条件指示，其形成于较低地温梯度（dT/dP≈300℃/GPa）下的活动大陆边缘冷俯冲构造环境，进一步表明至少从古元古代开始具有“冷俯冲”构造特征的现代板块构造体制已经启动.
- 扬子克拉通 /
- 古元古代水月寺混杂岩带 /
- 低温-高压榴辉岩相 /
- 石榴石-蓝晶石-硬绿泥石组合 /
- 冷俯冲构造折返
Abstract: In this paper, it documents for the first time the presence of the distinctive Grt-Ky-Cld assemblage low-temperature/high-pressure (LT-HP) eclogitic metapelites from the Paleoproterozoic Shuiyuesi mélange belt in the Kongling complex, Yangtze craton. The high-pressure metapelites display peak metamorphic mineral assemblages of garnet+kyanite+chloritoid+phengite+rutile+quartz. A near-isothermal decompression (ITD) clockwise P-T path with peak conditions of 571-576 ℃ and 19.2-21.8 kbar were estimated by phase equilibria modelling. The LA-ICP-MS zircon U-Pb dating shows that the metapelite has a metamorphic age of 1 991±20 Ma recorded by zircon rims and ages ranges from 2.1 to 2.2 Ga recorded detrital zircon cores. The sedimentary tectonic setting and metamorphic peak conditions of the Grt-Ky-Cld assemblage in eclogitic metapelites indicate that it has formed in a cold subduction zone with low thermal gradient (dT/dP≈300 ℃/GPa) at the active continental margin. Our study further implies that the modern plate tectonics with "cold subduction" tectonic characteristics has been initiated at least since the Paleoproterozoic.

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图 1 扬子克拉通黄陵穹隆北部崆岭杂岩地质简图

据Han et al.(2017)

Fig. 1. Simplified geological map of the Kongling complex in the northern Huangling dome, Yangtze craton

下载: 全尺寸图片幻灯片

图 2 变泥质岩野外露头及岩相学显微照片

a.变泥质岩显微结构特征，石榴石变斑晶中早期十字石包裹体；b.半自形蓝晶石、硬绿泥石周缘分别被十字石、绿泥石等环绕分布，显示退变质结构特征(单偏光)；c.毛发状夕线石集合体围绕蓝晶石残留斑晶生长；d.多硅白云母沿着石榴石裂隙分布(正交光)；e.退变质阶段自形十字石取代峰期蓝晶石斑晶(单偏光)；f.BSE显微结构图像显示晚期退变质阶段十字石取代峰期阶段蓝晶石，金红石边部退变为钛铁矿.矿物简写据Whitney and Evans(2010)；Chl.绿泥石; Cld.硬绿泥石; Grt.石榴石; Ilm.钛铁矿; Ky.蓝晶石; Pa.钠云母；Phe.多硅白云母；Qz.石英; Rt.金红石; Sil.夕线石; St.十字石

Fig. 2. Petrographic photomicrographs for the metapelites

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图 3 黄陵穹隆石榴石-蓝晶石-硬绿泥石组合高压变泥质岩变质P-T条件

a.MnNCKFMASHT体系下变质相平衡模拟计算P-T视剖面图，图中投点为Thermocalc 3.33平均温压法计算的变质P-T结果；b.水月寺混杂岩中石榴石-蓝晶石-硬绿泥石高压变泥质岩与全球不同造山带中类似样品峰期变质P-T对比.图b中Grt+Ky+Cld组合稳定域引自Smye et al. (2010).数据来源：1.Turkey (24±3 kbar，430±30 ℃；Okay，2002)；2.Iberian Massif，Spain(21~22 kbar，520 ℃；19~21 kbar，440±20 ℃；López-Carmona et al., 2013)；3.Gran Paradiso，Italy，West Alps(18~20 kbar，490 ℃；Chopin，1981；Le Bayon et al., 2006)；4.Sardinia，Italy(16~19 kbar，480±20 ℃，Cruciani et al., 2013)；5和6.Tauern Window，Eastern Alps(24.6 kbar，575 ℃；26.2 kbar，553 ℃；Holland，1979；Hoschek et al., 2010；Smye et al., 2010；Hoschek，2013)；7.Betic Cordillera，Spain(20.8 kbar，580 ℃；Smye et al., 2010)；8.Bohemian Massif(27.2 kbar，546 ℃；Konopásek，2001；Smye et al., 2010)；9.Raspas Complex，Andes(20.3 kbar，569 ℃；Gabriele et al., 2004；Smye et al., 2010)；10.Bughea Complex，Carpathians(21 kbar，560 ℃；24.6 kbar，590 ℃；Negulescu et al., 2009, 2018；Smye et al., 2010)；11.Sesia zone，Western Alps(29.9 kbar，544 ℃；Zucali et al., 2002；Smye et al., 2010)；12.Susong complex，Dabie orogenic belt(19.6~24.7 kbar，551~569 ℃；石永红等，2016)；13和14.Chuacus Complex，Central Guatemala(∼19.5~20 kbar，580~600 ℃；23~25 kbar and 620~690 ℃；Maldonado et al., 2016, 2018)

Fig. 3. Metamorphic P-T condition of the garnet-kyanite-chloritoid assemblage high-pressure metapelites from the Huangling dome

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图 4 黄陵穹隆北部古元古代高压变泥质岩典型锆石CL图像

Fig. 4. Cathodoluminescence (CL) images of representative zircon from the Paleoproterozoic high-pressure metapelites in the northern Huangling dome

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图 5 黄陵穹隆北部古元古代高压变泥质岩锆石U-Pb年龄协和图

Fig. 5. Zircon U-Pb concordia diagram for the Paleoproterozoic high-pressure metapelites from the northern Huangling dome

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