Late Mesozoic magma mixing in eastern Zhejiang Province: Evidence from U-Pb geochronology and geochemistry of Xiaojiang pluton in Xinchang
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摘要:
在中国东南沿海地区广泛发育的中生代中酸性岩浆岩中多处发现了暗色包体，被认为是大规模壳幔相互作用和岩浆混合作用的产物。本文获得了浙东新昌地区小将岩体的花岗岩及暗色闪长质包体的锆石U-Pb年代学和和地球化学新结果。锆石U-Pb定年表明寄主花岗岩(121.1±0.9Ma)与暗色闪长质包体(117.6±1.0Ma)近于同期形成于早白垩纪。寄主花岗岩为高硅、富碱、富钾、准铝质或弱过铝质的钙碱性花岗岩，具有较强的铕负异常(δEu=0.23~0.30)和Sr、Ba、P和Ti等元素的亏损，属于高分异的I型花岗岩；暗色闪长质包体具有重稀土亏损的特征，与寄主花岗岩在主量和微量元素上呈现混合作用趋势。小将岩体的上述特征与浙东晚中生代和福建沿海同期的岩浆岩特征一致，它们可能都是在早白垩纪伸展构造背景下，起源于俯冲交代的岩石圈地幔部分熔融产生的基性岩浆或者演化为闪长质成分，并与壳源花岗质岩浆发生混合作用的结果。本文研究为浙东及浙闽沿海地区晚中生代壳-幔作用和岩浆混合作用提供了新的证据。
Abstract:The mafic enclaves have been found in the widely distributed Mesozoic intrusives in southeast coast of China, which explained to be produced by crust-mantle reaction and magma mixing. This paper present new result of zircon U-Pb dating and geochemistry on the Xiaojiang pluton in Xinchang area, eastern Zhejiang Province. The zircon U-Pb ages of host granite (121.1±0.9Ma) and dioritic enclave (117.6±1.0Ma) were both intruding in Early Cretaceous simultaneously. The host rocks are peraluminous cal-alkaline granite, with enriched SiO2, total alkalis, and potassium. They also exhibit significant Eu negative anomaly (δEu=0.23~0.30), and depletion of Sr, Ba, P, and Ti. The host granites show the feature of highly-fractionated I-type granite. The dioritic enclaves are depleted in heavy rare earth elements (REEs), and forming a mixing trend with the host granites in both major and trace element compositions. The above geochemical features are agreed well with the Late Mesozoic intrusives from the coastal areas of eastern Zhejiang and Fujian provinces. The rocks possibly derived from the magma mixing between the basaltic magma (or evolved dioritic magma) originally from metasomatic mantle wedge partial melting, with the felsic magma from middle-lower crustal melting. This study provides a new evidence for the crust-mantle reaction and magma mingling in the southeastern coast of China.
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图 1
浙江新昌小将岩体群地质简图
Figure 1.
Simplified geological maps of the Xiaojiang plutons from Xinchang, Zhejiang
图 2
新昌小将岩体群寄主花岗岩(a)和闪长质包体(b)的锆石阴极发光图像
Figure 2.
CL images for zircons in the host granite (a) and dioritic enclave (b) from Xiaojiang plutons, Xinchang
图 3
新昌小将岩体群寄主花岗岩(a)和闪长质包体(b)的锆石U-Pb年龄谐和图
Figure 3.
U-Pb concordia diagrams of the host granite (a) and dioritic enclave (b) from Xiaojiang plutons, Xinchang
图 4
浙东花岗质岩体主量元素成分图
Figure 4.
Plots of major element compositions on total alkalis vs. silica (a, after Middlemost, 1994), potassium vs. silica (b, after Rickwood, 1989) and A/NK vs. A/CNK (c, after Maniar and Piccoli, 1989), along with literature data (from Xie et al., 2004; Zhang et al., 2005; Dong et al., 2008) on granitic and dioritic rocks from eastern Zhejiang Province
图 5
小将岩体群岩石稀土元素(a, 球粒陨石标准化值据Boynton, 1984)和微量元素(b, 原始地幔标准化值据Sun and McDonough, 1989)成分图
Figure 5.
Chondrite-normalized REE patterns (a, after Boynton, 1984) and primitive mantle-normalized trace-element spidergrams (b, after Sun and McDonough, 1989) of the Xiaojiang plutons
图 6
浙东花岗岩体主量元素协变图解
Figure 6.
Plots for major elements of granitic rocks from eastern Zhejiang province
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