Neoproterozoic basic magmatism in the north of Anhui Province: Evidence from whole-rock geochemistry and U-Pb geochronology of Diabase in Langan area
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摘要:
中国东部皖北地区分布着大量镁铁质岩，岩石类型为辉绿岩、辉绿辉长岩、辉绿玢岩等。本文对皖北栏杆地区侵位于元古宙地层中的辉绿岩进行系统的U-Pb年代学、岩石地球化学研究。结果显示，该区绝大多数辉绿岩的侵位结晶年龄为870~890 Ma，形成于新元古代早期。辉绿岩化学成分以高SiO2、CaO和（K2O < Na2O）为特征，属于板内碱性玄武岩系列岩石。总体上略富集轻稀土元素（LREE）、富集大离子亲石元素（LILE）Rb、Ba、La，略亏损高场强元素（HFSE）Th、Nb、Ta、Zr、Hf等，相对富集Cr和Ni。本次研究暗示皖北栏杆地区存在新元古代早期的构造-岩浆活动事件，并为金刚石带出地表创造了条件。结合新元古代全球Rodinia超大陆裂解事件及其岩浆活动与地幔柱的密切关系，皖北地区新元古代辉绿岩墙群应该是一次地幔柱作用在华北陆块边缘的记录。
Abstract:The mafic rock is exposed in North Anhui province of the East China. It consists of diabase, gabro-diabase and dabaseporphyrite. This paper presents a synthetic U-Pb isotopic study of zircons and a whole-rock geochemical study on diabase that were emplaced into the Proterozoic formations in the Langan area of the North Anhui province. The SHRIMP U-Pb zircon dating results indicate that the diabase were emplaced at ca.870-890 Ma. Geochemically, the diabase swarms are characterized by enriched in SiO2、CaO and (K2O < Na2O).It is therefore deduced that the diabases might belong to intraplate tholeiite occurring within the North China Plate. There are also show relative enrichment in LREE and LILE(Rb, Ba and La), a comparative enrichment in Cr and Ni, but a slight depletement in HFSE(Th, Nb, Ta, Zr and Hf).They are plotted in the within-plate tholeiite series on the tectonic discrimination diagrams. Taken together, these geochemical and isotopic data suggest that the primary magmas to form the diabase dykes in the Langan area could have been derived from a transitional mantle in the Mesoproterozoic, and were most probably emplaced under a continental margin extensional setting at ca.870-890 Ma. The results of this study demonstrate that the Neoproterozoic magmatism occurred at the Langan area of the North Anhui province, and created conditions for diamond mineralization. Taken along with the Neoproterozoic breakup of the Rodinia Supercontinent and the close relationship between the coeval magmatism and the hypothesis of a superplmue, it is reasonable to contribute the emplacement of the Neoproterozoic diabases in the Langan area to the geochemical fingerprints the contemporaneous mantle plume activity preserved in the continental margin of the North China Block.
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Key words:
- diamond minerliaztion /
- U-Pb /
- zircon dating /
- geochemistry /
- Langan
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图 6 辉绿岩SiO2-（Na2O+K2O）(a)和Nb/Y-Zr/TiO2图解(b)(据Le Bas et al., 1986)
Figure 6.
图 10 栏杆地区辉绿岩Zr-Nb（a）和Zr-Y（b）判别图解(Le Roex et al., 1983)
Figure 10.
图 11 栏杆辉绿岩构造判别（a）及K2O-TiO2-P2O5图解（b）(Pearce et al., 1979；Wood，1980；Meschede，1986)
Figure 11.
表 1 辉绿岩锆石SHRIMP U-Pb定年数据
Table 1. SHRIMP zircon U-Pb analytical results for the diabase in Langan area
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表 2 栏杆辉绿岩的主量元素含量(%)
Table 2. Compositions of major elements for the diabase in Langan area(%)
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表 3 栏杆辉绿岩的微量元素含量(10-6)
Table 3. Compositions of trace elements for the diabase in Langan area(10-6)
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