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国家自然科学基金(70914001)

作品数:3 被引量:28H指数:2
相关作者:徐义刚张辉煌于宋月邱华宁秦秀峰更多>>
相关机构:中国科学院有色金属矿产地质调查中心中国科学院研究生院更多>>
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Destruction of North China Craton:Insights from temporal and spatial evolution of the proto-basins and magmatism被引量:13
2013年
Temporal and spatial evolution of proto-basins and magmatism in the North China Craton might provide information of its destruction.Overall,the destruction of the North China Craton is a heterogeneous process of bottom upward and from margin toward interior,related to multiple interactions between the craton and its surrounding plates.The interior of craton would be initially destructed during the Early-Middle Jurassic.Subduction of the Paleo-Asian Ocean Plate may have destructed the northern margin of the North China Craton.Collision of the Yangtze Plate with the North China Craton is significant for the magmatic and tectonic activities during the Late Triassic-Middle Jurassic.Subductions of the Izanagi and Paleo-Pacific plates lead to the ultimate destruction of the North China Craton.Temporal and spatial evolution of the proto-basins and related magmatism in the North China Craton indicate that the dominant mechanism of the cratonic destruction may be thermal mechanical-chemical erosion.
LI HongYan
关键词:扬子板块中侏罗世板块俯冲
大陆亚碱性火山岩的成因多样性:以敦化-密山和东宁火山岩带为例被引量:14
2008年
对东北牡丹江海浪、鸡西鸡林、东宁老黑山三处亚碱性玄武岩类进行了^(40)Ar-^(39)Ar 定年和元素与 Sr-Nd-Pb 同位素组成研究,结果显示,始新世海浪(玄武)安山岩属钙碱性系列,相对富硅碱,贫铁钙,高度富集 Rb、Ba、Sr,亏损 Th、U、Nb、Ta,富集LREE 及极低的 HREE 含量,与五大连池钾质火山岩相近的同位素组成(^(206)Pb/^(204)Pb=16.56~16.66,^(207)Pb/^(204)Pb=15.44~15.47,^(208)Pb/^(204)Pb=36.80~36.95;I_(Sr)=0.704882~0.705564;ε_(Nd)=-4.05~2.29),表明来源于较厚的、受交代作用影响的含石榴石富集(LoMu)岩石圈地幔;中中新世鸡林拉斑玄武岩分布极为局限,辉石斑晶发育骸晶结构,富铁、钙、钛,不亏损 Nb、 Ta,富集 Ba、Sr,REE 相对平坦,HREE 高于 OIB,Sr、Nd 同位素组成相似于 Samoa 岛玄武岩,显示源区除软流圈成分外,还有EMII 富集组分的加入;晚中新世老黑山拉斑玄武岩,低碱低钾,LREE 轻度富集,Nb、Ta 不明显亏损,同位素比值与镜泊湖一带中新世碱性玄武岩范围一致,主要来源于软流圈并与富集岩石圈(EMI)发生过相互作用。地幔源区经历了古近纪富集地幔源到中新世软流圈组分增多的演化。东北新生代拉斑玄武岩不同的地球化学特征为认识大陆拉斑玄武岩成因的多样性提供了有益启示。
秦秀峰徐义刚张辉煌于宋月邱华宁
关键词:地球化学新生代
Effects of melt percolation on the Re-Os systematics of continental mantle lithosphere: A case study of spinel peridotite xenoliths from Heilongjiang, NE China被引量:1
2012年
Os isotope ratios of mantle peridotites have been considered to be largely immune to recent melt-rock interaction. However, Os isotope ratios and PGE (Platinum group elements) concentrations of the Yong'an xenoliths have been significantly modified by melt percolation, and are not suitable for determining the formation age of lithosphere mantle in Yong'an. In this study, the Yong'an spinel peridotite xenoliths are divided into two groups: N-Type and E-Type. The N-Type group including cpx (clinopyroxene)-poor lherzolite and harzburgite, shows a large variation of Cr#(sp) (13.2-48) and sulfur contents (from 171 ppm to below detection limit), whereas the E-Type peridotites are mainly refractory harzburgites and are characterized by high Cr#(sp) (35.3-42.2) and overall low sulfur contents (below 51 ppm). Both types show similar major and REE (rare earth element) patterns. Furthermore, the N-Type peridotites display a restricted range of iridium-group PGE (IPGE), Os/Ir and Ru/Ir ratios (Os/Ir = 0.64-1.12, Ru/Ir = 1.52-1.79) and variable palladium-group PGE (PPGE) contents (3.4-14.9 ppb), whereas the E-Type peridotites show a large variation of Os/Ir and Ru/Ir ratios (Os/Ir = 0.33-0.84, Ru/Ir = 0.94-1.6), and a restricted range of PPGE (4.3-6.9 ppb). 187Os/188Os ratios of E-Type peridotites are higher than those of N-Type peridotites at comparable fertility levels. These results suggest that N-Type peridotites may have been overprinted by metasomatism via small melt fractions, in which the percolation of the volatile-rich, small melt fractions only resulted in LILE (large ion lithophile element) enrichment of clinopyroxene, and their whole rock PGE contents and Re-Os isotope values were little changed. Moreover, E-Type peridotites may have been modified by melt-rock reaction involving relatively large melt fractions, which may result in the formation of secondary cpx and olivine and the removal of IPGE-bearing minerals such as Ru-Os-(Ir) alloys or laurite, followed by precipitation of secondary sulfides from melt with
YU SongYueSONG XieYanXU YiGangCHEN LieMengLI Jie
关键词:大陆岩石圈地幔橄榄岩包体RE-OS同位素
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