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| 1 | 西大别造山带早白垩世花岗岩地球化学特征与成矿显示文摘西大别造山带早白垩世花岗岩广泛发育,具有高硅(SiO272.94%~77.56%),富碱(K2O+Na2O7.06%~8.78%),高K2O/Na2O(1.12%~2.12%),贫镁(MgO0.13%~0.80%),贫钙(CaO0.32%~0.96%)的特征。主量元素质量平衡模拟计算表明,西大别花岗岩形成于大别角闪石片麻岩的部分熔融,并有较多的角闪石和少量石榴石残留,结合中稀土出现一定的亏损,指示重熔作用很可能发生于增厚下地壳的环境。早白垩世岩浆活动与成矿,构成了对中国东部中生代大规模岩石圈减薄、拆沉的响应。 | 翟东兴 胡国民 张侍威 | 2011 | 矿产勘查2011，2，5： | 2 |
| 2 | 大别山镁铁质下地壳的Pb同位素成分:来自榴辉岩的制约显示文摘北大别高温超高压杂岩带中榴辉岩的岩石学和地质年代学研究已经证明它们为华南板块新元古代镁铁质下地壳岩石经三叠纪深俯冲变质成因。基于此,开展了北大别榴辉岩的Pb同位素地球化学研究。结果表明:北大别榴辉岩表现出与北大别片麻岩相似的低放射性成因Pb同位素特征,并具有更低的N(^(208)Pb)/N(^(204)Pb)值;其初始Pb同位素组成分别为N(^(206)Pb)/N(^(204)Pb)i=15.217~17.522,N(^(207)Pb)/N(^(204)Pb)i=15.077~15.540和N(^(208)Pb)/N(^(204)Pb)i=35.219~38.082,表现出目前已知的大别造山带3个含榴辉岩的超高压变质岩片中最低的Pb同位素组成,这进一步证明北大别榴辉岩的原岩来自于俯冲镁铁质下地壳;北大别榴辉岩表现出较宽的Pb同位素组成变化范围,其中最低的Pb同位素组成源自于具有低w(U)/w(Pb)值、低w(Th)/w(U)值演化特征的晚太古代至古元古代镁铁质下地壳,而相对较高的Pb同位素组成则继承于新元古代底侵的幔源岩浆,表明北大别榴辉岩的Pb同位素特征是幔源岩浆混染古老镁铁质下地壳的结果。与大别山中生代埃达克质岩的Pb同位素对比研究表明,早白垩纪拆沉再循环的陆壳物质中不仅含有镁铁质下地壳岩石,还含有长英质下地壳物质,大别山深部的长英质下地壳随镁铁质下地壳一起拆沉并再循环进入地幔。 | 古晓锋 刘贻灿 刘佳 | 2017 | 地球科学与环境学报2017，39，1： | 1 |
| 3 | Mesozoic “Red Beds” and its Evolution in the Hefei Basin显示文摘The Hefei Basin is the largest basin in the North China landmass with complete and well- preserved Mesozoic and Cenozoic strata. In the basin there developed a suite of extremely thick 'red beds' in the Mesozoic. Owing to complex evolution processes and a lack of paleontological traces, there have been controversies regarding the division and correlation of this suite of red beds. Based on results obtained in recent years in drilling, seismic and surface geological investigations and in consideration of relationships between seismic sequences and regional tectonic events, as well as evidence in paleontology, petrology and isotopic dating, this paper preliminarily puts forward the following ideas about the sequence stratigraphic framework of the continental 'red beds' in the Hefei Basin. (1) The Zhougongshan Formation and the Yuantongshan Formation have similar lithologic, geophysical and paleontological characteristics, so we incorporate them into a single formation, called the Yuantongshan Formation, and the original Zhougongshan and Yuantongshan Formations are regarded as the upper and the lower parts of the newly defined Yuantongshan Formation. Its age is the Middle Jurassic; (2) the Zhuxiang Formation belongs to the Upper Jurassic Series and (3) the age of the Xiangdaopu Formation is the Lower Cretaceous. Furthermore, signatures of depositional evolution are analyzed in the paper based on features of seismic reflection, outcrops and drilling data. The Early and Middle Jurassic is characterized by a foreland basin, which is influenced mainly by uplift and longitudinal compression of the Dabieshan Mountains; the Lower Jurassic System has a relatively small depositional area; the Middle Jurassic strata are distributed extensively over the whole basin, marking the summit of basin development; a flexure basin is characteristic of the Late Jurassic, manifesting a joint effect of the Dabieshan and Zhangbaling Mountains with the former being more significant. In the Early Cretaceous, the Xiangdaopu Formation was distributed in the Daqiao depression, evidently affected by extension of the Tanlu fault; in the Late Cretaceous, the Hefei Basin was subjected to dismembering and the Zhangqiao Formation was distributed in the east-west direction along the downthrown side of the fault. | ZHANG Jiaodong CHEN Xuanhua LI Qiuli LIU Chengzhai LI Bing LI Jie LIU Gang REN Fenglou | 2012 | Acta Geologica Sinica(English Edition)2012，86，5： | 0 |
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