The timing of final closure along the Changchun-Yanji suture zone: Constraints from detrital zircon U-Pb dating of the Triassic Dajianggang Formation, NE China
The timing of final closure along the Changchun-Yanji suture zone: Constraints from detrital zircon U-Pb dating of the Triassic Dajianggang Formation, NE China
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长春-延吉缝合带最终闭合时间：中国东北三叠纪大江岗组碎屑锆石U-Pb测年的制约
DOI：
10.1016/j.lithos.2015.11.017
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发表时间：
2016-09
期刊：
影响因子：
3.5
通讯作者：
Ren, Shou-Mai
中科院分区：
文献类型：
--
作者：
Zhou, Jian-Bo;Wilde, Simon A.;Zhang, Xing-Zhou;Ren, Shou-Mai
大姜岗组位于吉林省中部的长春-延吉缝合带，不整合地覆盖在长春-延吉增生杂岩之上，后者是佳木斯-兴卡地块俯冲到华北陆块之下的产物。对四个样品进行LA-MC-ICP-MS U-Pb定年，测得年龄为2516 ~ 216 Ma。锆石U-Pb年龄分别为2516-2501 Ma和1897-1832 Ma，表明其物源来自华北克拉通前寒武纪基底岩石。525-482 Ma年龄表明JKB中泛非晚期变质岩的物源与中亚造山带（CAOB）具有构造相似性。年龄为383-314 Ma和275-250 Ma的锆石颗粒可能来自下伏CYAC。最年轻的人口有一个高峰年龄约。225 Ma，结合晚三叠世化石，推测大江港组的沉积时代为晚三叠世或更早。这一结果支持了JKB和NCC沿着长春-延吉缝合带的最终碰撞发生在晚三叠世之前的观点。该缝合带的闭合时间比索龙克-沙尔木龙-长春缝合带晚二叠世的闭合时间晚沿着10-20 Ma。因此，我们认为长春-延吉缝合带与西伯利亚板块（SC）和NCC之间的碰撞无关，而是与古太平洋板块俯冲有关。因此，长春-延吉缝合带不是以往所认为的索隆克-萨尔木伦-长春缝合带的东延，而是吉黑高压变质带（吉黑高压带）的南缘，是古太平洋向西俯冲的产物。因此，晚三叠世标志着中国东北地区俯冲作用由古亚洲洋向古太平洋的转换。
The Dajianggang Formation is located in the Changchun–Yanji suture zone of central Jilin Province and unconformably overlies the Changchun–Yanji Accretionary Complex (CYAC), which is a mélange resulting from subduction of the Jiamusi–Khanka Block (JKB) beneath the North China Craton (NCC). LA-MC-ICP-MS U–Pb dating of detrital zircon from four samples of the formation yields ages of 2516 to 216 Ma. Zircons with U–Pb ages at 2516–2501 Ma and 1897–1832 Ma indicate a provenance from Precambrian basement rocks of the NCC. The 525–482 Ma ages indicate a provenance from metamorphic rocks of Late Pan-African age in the JKB that have a tectonic affinity to the Central Asian Orogenic Belt (CAOB). Zircon grains with ages of 383–314 Ma and 275–250 Ma were likely derived from the underlying CYAC. The youngest population has a peak age of ca. 225 Ma, which together with Late Triassic fossils, suggests that deposition of the Dajianggang Formation was Late Triassic or younger. This result supports the view that the final collision of the JKB and NCC along the Changchun–Yanji suture took place before the Late Triassic. Furthermore, this closure time is at least 10–20 Ma later than closure along the Solonker–Xar Moron–Changchun suture in the Late Permian. We thus establish that the Changchun–Yanji suture is not related to the collision between the Siberia Craton (SC) and the NCC but was instead related to the Paleo-Pacific plate subduction. Consequently, the Changchun–Yanji suture is not the eastward extension of the Solonker–Xar Moron–Changchun suture as previously considered, but the southern margin of the Jilin–Heilongjiang high-pressure metamorphic belt (Ji–Hei HP belt), and resulted from westward subduction of the Paleo-Pacific Ocean. Thus, the Late Triassic marked the switch in subduction from the Paleo-Asian Ocean to the Paleo-Pacific Ocean in NE China.
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