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首页> 外文期刊>Geological Journal >Zircon U–Pb dating and whole‐rock geochemistry of volcanic rocks in eastern Heilongjiang Province, NE China: Implications for the tectonic evolution of the Mudanjiang and Paleo‐Pacific oceans from the Jurassic to Cretaceous
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Zircon U–Pb dating and whole‐rock geochemistry of volcanic rocks in eastern Heilongjiang Province, NE China: Implications for the tectonic evolution of the Mudanjiang and Paleo‐Pacific oceans from the Jurassic to Cretaceous

机译：黑龙江省东部的锆石岩石历史和全岩地球化学，NE中国：对侏罗纪对白垩纪的牡丹江和古太平洋构造演变的影响

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>The eastern Heilongjiang Province, NE China, is located in the eastern CAOB (Central Asian Orogenic Belt). Previous studies suggest that subduction of the Mudanjiang and Paleo‐Pacific oceans had been initiated in this area during the early Mesozoic. However, research on the Mesozoic volcanic rocks is insufficient, limiting our understanding of the relationship between magmatism and subduction process. To solve the problem, seven volcanic rocks in the Lesser Xing'an‐Zhangguangcai Range and the Jiamusi Block were collected for zircon U–Pb dating (SHRIMP) and whole‐rock geochemical analysis. Most samples from the Lesser Xing'an‐Zhangguangcai Range are Jurassic in age (189–178?Ma), including andesite, trachyandesite, trachydacite, and rhyolite. The andesitic to trachytic rocks were generated by magma mixing at an active continental margin, whereas the rhyolite is highly fractionated I‐type. All the samples from the Jiamusi Block and one basaltic andesite from the Lesser Xing'an Range are late Early Cretaceous in age (ca. 100?Ma) and were formed in a back‐arc extensional setting (roll‐back). Fractional crystallization was important in the generation of most Cretaceous rocks (basalt to trachydacite). However, magma mixing or crustal contamination was required to explain some andesites from the Jiamusi Block showing extremely low Cr, Ni, and Mg#. When integrated with the coeval blueschist‐facies metamorphism, the Early Jurassic volcanism indicates an active continental margin in the Lesser Xing'an‐Zhangguangcai Range due to the westward subduction of the Mudanjiang Ocean. After the closure of the Mudanjiang Ocean, two NE/NNE trending sinistral strike‐slip faults in NE China were triggered, accompanied by the slab roll‐back of the Paleo‐Pacific oceanic plate. The Jurassic continental arc and accretionary complexes in NE China were cut through by the two strike‐slip faults and bended to form small oroclines. At ca. 100?Ma, numerous accretionary complexes were accreted along the eastern margin of the CAOB, further forcing the retreat of trench and slab roll‐back. The late Early Cretaceous intra‐continental volcanism was generated in the Lesser Xing'an‐Zhangguangcai Range and Jiamusi Block during this roll‐back process.
机译： >东部黑龙江省，诺中国，位于东曹（中亚洲造山带）。以前的研究表明，在早期中生代期间，该地区已在该地区启动了牡丹江和古太平洋的俯冲。然而，对中生代火山岩的研究不足，这限制了我们对岩浆学与俯冲过程之间关系的理解。为了解决这个问题，为Xing'an-Zhangguangcai系列和佳木斯街区的七个火山岩被收集为锆石U-PB约会（虾）和全岩地球化学分析。来自兴安 - 张光牌范围较小的大多数样本是侏罗纪（189-178？ma），包括安德莱特，龟囊石，龟窝斑酸和流纹岩。通过在活跃的大陆边缘处的岩浆混合产生的岩体至异岩岩石，而细胞势块是高度分馏的I型。来自巨型Xing'an范围的佳木群和一个玄武岩中的所有样品都是年龄（CA.100？MA）的早期白垩纪延迟白垩纪，并且形成在后弧延伸设定（回滚）中。分数结晶在最多的大多数白垩纪岩石（玄武岩到曲晶酸盐）中是重要的。然而，需要岩浆混合或地壳污染来解释来自佳木斯块的一些和岩石，显示出极低的Cr，ni和mg＃。当与科夫布鲁斯的相片变形相结合时，早期的侏罗纪州的火山主义表明，由于牡丹江海洋向西介绍，兴安张光牌范围较小的大陆边缘。在关闭牡丹江海洋后，触发了NE中国的两个NE / NNE Trensing Sinistral Stript-Slip故障，伴随着古太平洋板块的板坯回来。侏罗纪欧洲弧和NE中国的含量复合体被两次滑行断层切割，并弯曲形成小的Oroclines。在加利福尼亚州。 100？MA，沿曹氏缘的东部裕度施加了许多增生络合物，进一步迫使沟槽和板坯的撤退。在此回滚过程中较小的兴安 - 张广域系列和佳木斯块，在兴安 - 张光牌和佳木斯块中产生了较晚的白垩纪内部。

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