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Linking ∼1.4-0.8 Ga volcano-sedimentary records in eastern Central Asian Orogenic Belt with southern Laurentia in supercontinent cycles
Gondwana Research ( IF 6.1 ) Pub Date : 2021-10-05 , DOI: 10.1016/j.gr.2021.09.019
Zhiwei Wang 1, 2 , Zhihui Wang 1, 2 , Yanjie Zhang 1, 2 , Bei Xu 1, 2 , Yanguang Li 3, 4 , Yingjie Tian 1, 2 , Yicun Wang 1, 2 , Jia Peng 2
Affiliation  

The record of Meso- to Neoproterozoic magmatism and sedimentation from the western Xing’an-Airgin Sum Block (XAB), eastern Central Asian Orogenic Belt (CAOB), provides the first key evidence for the close affinity between XAB and southern Laurentia, as well as the linkage with the supercontinent cycles. The ∼1.4 Ga calc-alkline granite-rhyolite association within the western XAB was probably the product of extension on a long-lived retreating convergent margin during the Columbia breakup, remarkably similar to the coeval Granite-Rhyolite Province in the southern Laurentia. Siliciclastic, mixed clastic and carbonate sequences of the Airgin Sum Group accumulated on the western XAB during two stages at 1.00-0.92 and 0.87-0.75 Ga, which were comparable with the syn- to post-orogenic successions on the southern Laurentia margin representing two dominant phases of the Grenville orogenic cycle in the Rodinia assembly. The Columbia breakup to Rodinia assembly also correlated well with the shift of zircon Hf isotope from a long-term juvenile crustal growth (1.6-1.2 Ga) to the rapid crustal reworking (1.1-0.8 Ga), and with the changes of zircon trace elements over time in the western XAB. The ever-growing new discovery of predominant 1.5-1.3, 0.9-0.8 Ga detrital zircon age peaks and coeval magmatism in many blocks worldwide suggests that they recorded much more intense magmatic activity, exhumation and deposition than previous thought. Juvenile crustal growth underestimated in previous researches, occurred extensively in blocks within the CAOB and Columbia at ∼1.5-1.3 Ga, and crust reworking significantly dominated the crustal evolution during the Rodinia assembly in 1.1-0.8 Ga.



中文翻译:

将中亚造山带东部的 ∼1.4-0.8 Ga 火山-沉积记录与超大陆旋回中的劳伦大陆南部联系起来

中亚造山带东部(CAOB)兴安-艾尔金沙地(XAB)西部中-新元古代岩浆作用和沉积的记录,为XAB与劳伦西亚南部之间的密切联系提供了第一个关键证据作为与超大陆周期的联系。XAB 西部约 1.4 Ga 钙碱性花岗岩-流纹岩组合可能是哥伦比亚断裂期间长期后退会聚边缘延伸的产物,与同时期的劳伦西亚南部花岗岩-流纹岩省非常相似。Airgin Sum 组的硅质碎屑、混合碎屑和碳酸盐层序在 1.00-0.92 和 0.87-0.75 Ga 的两个阶段在西 XAB 上积累,这与代表 Rodinia 组合中 Grenville 造山旋回的两个主要阶段的 Laurentia 南部边缘的同造山到造山后的序列相当。哥伦比亚破碎到 Rodinia 组合体也与锆石 Hf 同位素从长期幼年地壳生长 (1.6-1.2 Ga) 向快速地壳改造 (1.1-0.8 Ga) 的转变以及锆石微量元素的变化密切相关随着时间的推移在西部 XAB。在全球许多区块中不断发现的主要 1.5-1.3、0.9-0.8 Ga 碎屑锆石年龄峰值和同时期岩浆活动的新发现表明,它们记录的岩浆活动、剥脱和沉积比以前认为的要强烈得多。幼年地壳生长在先前的研究中被低估,广泛发生在 CAOB 和 Columbia 内的块体中,约 1.5-1.3 Ga,

更新日期:2021-10-06
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