浙北地区晚中生代侵入岩锆石U-Pb年代学及Hf同位素地球化学:成因演化过程及其构造环境示踪
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摘要
浙北地区位于扬子陆块东南缘,中生代岩浆侵入活动强烈,发育有何村石英二长岩、康山、沈家墈、泗岭花岗岩和凤凰山正长花岗岩等岩体。锆石LA-ICP-MS U-Pb定年结果表明,何村石英二长岩侵位时间为149.2±1.1 Ma,康山花岗岩形成于137.4±1.2 Ma,沈家墈、泗岭花岗岩和凤凰山正长花岗岩的成岩年龄在133.6±0.95 Ma~131.3±1.7 Ma之间。地球化学分析结果显示,何村石英二长岩为高钾钙碱性系列准过铝质I型花岗岩,高Rb、Th、U、K,贫Nb、Ta、Ti,中等的Eu负异常(δEu=0.78~0.79),具有类似岛弧岩浆岩的特征,锆石饱和温度为826~830℃。康山、沈家墈、泗岭花岗岩及凤凰山正长花岗岩地球化学特征相似,岩石富Si O2,高Ga、Zr、Nb和Y,贫Al2O3、Sr、Ba、Ti和P,强烈的Eu负异常(δEu=0.02~0.12);区别在于前者Fe2O3T含量为0.63%~0.89%,母岩浆温度为788~814℃,显示高分异I型特征;后三者Fe2O3T含量为1.02%~1.57%,母岩浆温度为847~868℃,属铝质A型花岗岩。锆石Hf同位素研究表明,何村石英二长岩和康山花岗岩εHf(t)变化范围分别集中在-3.79~-1.67和-6.59~-5.23之间,二阶段模式年龄(tDM2)变化范围对应于1162~1279 Ma和1350~1423 Ma,说明其源区物质可能主要来自中元古代地壳;沈家墈、泗岭花岗岩和凤凰山正长花岗岩εHf(t)主要集中在-4.24~2.48之间,tDM2主要集中于915~1161 Ma之间,说明岩体的源区物质来自于中-新元古代江南火山岛弧,εHf(t)值逐渐增大,表明越来越多的幔源物质或新生地壳参与成岩。浙北地区三类岩体分别形成于晚侏罗世古太平洋板块俯冲的挤压、早白垩世板块撤离挤压向伸展背景的转换和后造山拉张背景下岩石圈减薄等3个阶段。
Mesozoic intrusions are widespread in northern Zhejiang, the southeastern margin of the Yangtze Block, within which five intrusions were selected for investigation, including the Hecun quartz monzonite, the Kangshan, Shenjiakan, and Siling granites, and the Fenghuangshan syenogranite. The Hecun quartz monzonite is metaluminous and high-K calc-alkalic, showing I-type features such as high LILE(Rb, K, Th, U) and relatively low HFSE(Nb, Ta, Ti) concentrations with mild negative Eu anomalies(δEu=0.78–0.79). The Kangshan, Shenjiakan, and Siling granites and the Fenghuangshan syenogranite have similar geochemical features, including relatively low Al2 O3, Sr, Ba, Ti, P, extremely negative Eu anomalies(δEu=0.02–0.12), and high Si O2, Ga, Zr, Nb, Y. However, the Kangshan granite has Fe2 O3 T of 0.63%–0.89% and magma temperatures of 788–814 ℃, showing characteristics of highly fractionated I-type granites, whereas the Shenjiakan and Siling granites and the Fenghuangshan syenogranite have higher Fe2 O3 T(1.02%– 1.57%) and high magma temperatures(847–868 ℃), suggestive of A-type affinity. Zircon U-Pb dating of the Hecun quartz monzonite, the Kangshan, Shenjiakan, and Siling granites and the Fenghuangshan syenogranite yielded ages of 149.2±1.1 Ma, 137.4±1.2 Ma, 133.6±0.95 Ma, and 131.3±1.7 Ma, respectively. The Hecun quartz monzonite and the Kangshan granite have εHf(t) values in ranges of-3.79 to-1.67 and-6.59 to-5.23, respectively, and crust Hf model ages(tDM2) of 1162–1279 Ma and 1350–1423 Ma correspondingly, which suggest that these granites were likely originated from remelting of Mesoproterozoic crustal materials. In contrasts, the Shenjiakan and Siling granites and the Fenghuangshan syenogranite have εHf(t) values of-4.24 to 2.48 and crust Hf model ages(tDM2) of 915–1161 Ma, which suggest that these granites were mainly originated from remelting of the Meso-Neoproterozoic Jiangnan Island Arc with substantial mantle input. Combined with previous results, we infer that the Hecun quartz monzonite was formed in a subduction setting in the late Jurassic, and the Kangshan granite formed in a compression to extension transition stage of the post-collisional environment, while the Shenjiakan and Siling granites and the Fenghuangshan syenogranite formed in an extensional setting of Early Cretaceous.
Mesozoic intrusions are widespread in northern Zhejiang, the southeastern margin of the Yangtze Block, within which five intrusions were selected for investigation, including the Hecun quartz monzonite, the Kangshan, Shenjiakan, and Siling granites, and the Fenghuangshan syenogranite. The Hecun quartz monzonite is metaluminous and high-K calc-alkalic, showing I-type features such as high LILE(Rb, K, Th, U) and relatively low HFSE(Nb, Ta, Ti) concentrations with mild negative Eu anomalies(δEu=0.78–0.79). The Kangshan, Shenjiakan, and Siling granites and the Fenghuangshan syenogranite have similar geochemical features, including relatively low Al2 O3, Sr, Ba, Ti, P, extremely negative Eu anomalies(δEu=0.02–0.12), and high Si O2, Ga, Zr, Nb, Y. However, the Kangshan granite has Fe2 O3 T of 0.63%–0.89% and magma temperatures of 788–814 ℃, showing characteristics of highly fractionated I-type granites, whereas the Shenjiakan and Siling granites and the Fenghuangshan syenogranite have higher Fe2 O3 T(1.02%– 1.57%) and high magma temperatures(847–868 ℃), suggestive of A-type affinity. Zircon U-Pb dating of the Hecun quartz monzonite, the Kangshan, Shenjiakan, and Siling granites and the Fenghuangshan syenogranite yielded ages of 149.2±1.1 Ma, 137.4±1.2 Ma, 133.6±0.95 Ma, and 131.3±1.7 Ma, respectively. The Hecun quartz monzonite and the Kangshan granite have εHf(t) values in ranges of-3.79 to-1.67 and-6.59 to-5.23, respectively, and crust Hf model ages(tDM2) of 1162–1279 Ma and 1350–1423 Ma correspondingly, which suggest that these granites were likely originated from remelting of Mesoproterozoic crustal materials. In contrasts, the Shenjiakan and Siling granites and the Fenghuangshan syenogranite have εHf(t) values of-4.24 to 2.48 and crust Hf model ages(tDM2) of 915–1161 Ma, which suggest that these granites were mainly originated from remelting of the Meso-Neoproterozoic Jiangnan Island Arc with substantial mantle input. Combined with previous results, we infer that the Hecun quartz monzonite was formed in a subduction setting in the late Jurassic, and the Kangshan granite formed in a compression to extension transition stage of the post-collisional environment, while the Shenjiakan and Siling granites and the Fenghuangshan syenogranite formed in an extensional setting of Early Cretaceous.
引文
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华仁民,陈培荣,张文兰,陆建军.2005.论华南地区中生代3次大规模成矿作用.矿床地质,24(2):99-107.
华仁民,李光来,张文兰,胡东泉,陈培荣,陈卫锋,王旭东.2010.华南钨和锡大规模成矿作用的差异及其原因初探.矿床地质,29(1):9-15.
华仁民,毛景文.1999.试论中国东部中生代成矿大爆发.矿床地质,18(4):300-308.
华仁民,张文兰,姚军明,陈培荣.2006.华南两种类型花岗岩成岩?成矿作用的差异.矿床地质,25(S1):127-130.
李福林,周汉文,唐增才,李益龙,汪发祥,徐于晨,覃洪锋,罗微,关成国.2011.浙江淳安木瓜基性岩墙群U-Pb年龄、地球化学特征及意义.地球化学,40(1):22-34.
李晓峰,Watanabe Yasushi,华仁民,毛景文.2008.华南地区中生代Cu-(Mo)-W-Sn矿床成矿作用与洋岭/转换断层俯冲.地质学报,82(5):625-640.
李小伟,莫宣学,赵志丹,朱弟成.2010.关于A型花岗岩判别过程中若干问题的讨论.地质通报,29(2?3):278-285.
毛建仁,高桥浩,厉子龙,中岛隆,叶海敏,赵希林,周洁,胡青,曾庆涛.2009.中国东南部与日本中?新生代构造?岩浆作用对比研究.地质通报,28(7):844-856.
毛景文,陈懋弘,袁顺达,郭春丽.2011.华南地区钦杭成矿带地质特征和矿床时空分布规律.地质学报,85(5):636-657.
毛景文,谢桂青,程彦博,陈毓川.2009.华南地区中生代主要金属矿床模型.地质论评,55(3):347-354.
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