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黑龙江依兰地区早白垩世花岗岩的年代学及地球化学特征

来源：花匠小妙招时间：2025-07-01 00:59

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刘希雯1 ，王锶淼2 ，高妍2 ，张彦龙2 ，赵春晖3 ，范颖鑫4 ，杨浩2

Geochronological and geochemical characteristics of Early Cretaceous granite in Yilan area，Heilongjiang

LIU Xiwen1 ，WANG Simiao 2 ，GAO Yan2 ，ZHANG Yanlong 2 ，ZHAO Chunhui 3 ，FAN Yingxin4 ，YANG Hao 2

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锆石 LA--ICP--MS U--Pb 定年分析结果表明依兰地区花岗岩形成于 ( 112 ± 2) Ma，为早白垩世岩浆作用产物。全岩主微量元素特征显示，研究区花岗岩样品具有较高的 w ( SiO2 ) ( 74. 66% ～ 75. 60% ) 和 w ( Na2O + K2O) ( 8. 32% ～ 8. 41% ) ，属高钾钙碱性系列岩石范围。此外，这些花岗岩样品轻重稀土元素分馏明显，表现出轻稀土元素和大离子亲石元素的富集，重稀土元素和高场强元素的亏损，同时表现出明显的铕负异常 ( Eu /Eu* = 0. 40 ～ 0. 47) 。结合全岩地球化学特征，认为研究区早白垩世花岗岩为高分异 I 型花岗岩，来源于亏损地幔新增生地壳物质的部分熔融。综合前人研究成果，认为黑龙江依兰地区早白垩世花岗岩的形成可能与古太平洋板块的回卷密切相关。

Abstract

The results of LA--ICP--MS zircon U--Pb dating indicate that the granite in Yilan area formed at ( 112 ± 2) Ma，which is the product of Early Cretaceous magmatism． The Early Cretaceous granite samples in the study area are characterized by high w ( SiO2 ) ( 74. 66% ～ 75. 60% ) and high w ( Na2O + K2O) ( 8. 32% ～ 8. 41% ) ，which are high potassium calc-alkaline series rocks． In addition，these granite samples are enriched in large ion lithophile elements and light rare earth elements，and depleted in heavy rare earth elements and high field strength elements，with obvious negative Eu anomalies ( Eu /Eu* = 0. 40 ～ 0. 47) ． Based on the above geochemical characteristics，the authors suggest the Early Cretaceous granites in the study area are highly fractionated I-type granites，and they were derived from partial melting of newly generated crustal materials that were originated from the depleted mantle． Combined with the previous research results，the authors propose that the generation of the Early Cretaceous granite in Yilan area of Heilongjiang Province might be closely associated with the rollback of the Paleo --Pacific plate．

关键词

早白垩世 /花岗岩 /年代学 /地球化学 /俯冲作用 /依兰地区{{custom_keyword}} /

Key words

Early Cretaceous /granite /geochronology /geochemistry /subduction /Yilan area{{custom_keyword}} /

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刘希雯, 王锶淼, 高妍, 张彦龙, 赵春晖, 范颖鑫, 杨浩. 黑龙江依兰地区早白垩世花岗岩的年代学及地球化学特征[J]. 世界地质, 2023, 42(1): 26-36

LIU Xiwen, WANG Simiao, GAO Yan, ZHANG Yanlong, ZHAO Chunhui, FAN Yingxin, YANG Hao . Geochronological and geochemical characteristics of Early Cretaceous granite in Yilan area，Heilongjiang[J]. World Geology, 2023, 42(1): 26-36

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