共查询到20条相似文献，搜索用时 368 毫秒
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Lu Zongsheng Huang Qisheng Faculty of Earth Sciences China University of Geosciences Wuhan Li SitianFaculty of Earth Resources China University of Geosciences Wuhan 《中国地质大学学报(英文版)》1997,(1)
ＳｔｒａｔｉｇｒａｐｈｉｃＳｕｃｅｓｉｏｎ，Ｓｏｕｒｃｅ┐ＲｏｃｋＤｉｓｔｒｉｂｕｔｉｏｎａｎｄＰａｌｅｏｃｌｉｍａｔｉｃＺｏｎｅｉｎＭｅｓｏ－ＣｅｎｏｚｏｉｃＢａｓｉｎｓ，ＥａｓｔｅｒｎＣｈｉｎａ＊ＬｕＺｏｎｇｓｈｅｎｇＨｕａｎｇＱｉｓｈｅｎｇＦａ... 相似文献
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ＣＯＮＣＥＰＴＩＯＮＳＯＦＨＥＡＶＹＦＬＯＯＤＳＣＡＵＳＩＮＧＬＡＮＤ┐ＳＬＩＤＥ／ＳＬＩＤＥＴｈｅｒｅａｒｅｍａｎｙｄｉｓａｓｔｅｒｓ／ｈａｚａｒｄｓｏｃｃｕｒｉｎｇｏｎｔｈｅｅａｒｔｈ’ｓｓｕｒｆａｃｅ．Ｔｈｅｓｅｅｖｅｎｔｓｐｒｅｓｅｎｔｅｄａ... 相似文献
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ＴｈｅＩｎｔｅｒｎａｔｉｏｎａｌＳｙｍｐｏｓｉｕｍｏｎｔｈｅＧＳＳＰｏｆｔｈｅＰｅｒｍｉａｎ ＴｒｉａｓｓｉｃＢｏｕｎｄａｒｙａｎｄｔｈｅＰａｌｅｏｚｏｉｃ ＭｅｓｏｚｏｉｃＥｖｅｎｔｓｗａｓｈｅｌｄｉｎＣｈａｎｇｘｉｎｇＣｏｕｎｔｙ ,ＺｈｅｊｉａｎｇＰｒｏｖｉｎｃｅ,ＣｈｉｎａｏｎＡｕｇｕｓｔ 1 0 - 1 3,2 0 0 1 .Ｔｈｅｓｙｍｐｏｓｉｕｍｒｅｃｅｉｖｅｄａｎｄ ｐｒｉｎｔｅｄ 47ａｂｓｔｒａｃｔｓ.Ａｂｏｕｔ 60ｇｅｏｌｏｇｉｓｔｓｆｒｏｍ 1 3ｃｏｕｎｔｒｉｅｓａｔｔｅｎｄｅｄｔｈｅｓｃｉｅｎｔｉｆｉ… 相似文献
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Suo Shutian 《中国地质大学学报(英文版)》1995,(1)
Ｃｒｕｓｔａｌ Ｔｅｘｔｕｒｅ ａｎｄ Ｒｈｅｏｌｏｇｉｃａｌ Ｅｖｏｌｕｔｉｏｎ ｏｆＴｏｎｇｂａｉ－Ｄａｂｉｅ Ｏｒｏｇｅｎｉｃ Ｂｅｌｔ，Ｃｈｉｎａ￥ＳｕｏＳｈｕｔｉａｎ（ＦａｃｕｌｔｙｏｆＥａｒｔｈＳｃｉｅｎｃｅｓ，ＣｈｉｎａＵｎｉｖｅｒｓｉ... 相似文献
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Xu ChangfangGeological Institute State Seismological Bureau of China Beijing 《中国地质大学学报(英文版)》1997,(1)
ＣｈｉｎａＣｏｎｔｉｎｅｎｔａｌＣｏｎｄｕｃｔｉｖｅＬａｙｅｒｓａｎｄＩｔｓＲｅｌａｔｉｏｎｓｈｉｐｗｉｔｈＢａｓｉｎＥｖｏｌｕｔｉｏｎ＊ＸｕＣｈａｎｇｆａｎｇＧｅｏｌｏｇｉｃａｌＩｎｓｔｉｔｕｔｅ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏ... 相似文献
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StudyonSealevelFluctuationGeodynamicsofCarbonateDepostitionalCyclesintheNorthChinaPlatform－－theCambr
《沉积学报》1996,(2)
ＳｔｕｄｙｏｎＳｅａｌｅｖｅｌＦｌｕｃｔｕａｔｉｏｎＧｅｏｄｙｎａｍｉｃｓｏｆＣａｒｂｏｎａｔｅＤｅｐｏｓｔｉｔｉｏｎａｌＣｙｃｌｅｓｉｎｔｈｅＮｏｒｔｈＣｈｉｎａＰｌａｔｆｏｒｍ－－ｔｈｅＣａｍｂｒｉａｎＭｉｌａｎｋｏｖｉｔｃｈＧｅｏｌｏｇｉｃａｌ... 相似文献
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Zhang Da 《中国地质大学学报(英文版)》1999,10(1):38-42
ＩＮＴＲＯＤＵＣＴＩＯＮＳｏｕｔｈＣｈｉｎａ,ｗｈｉｃｈｉｎｃｌｕｄｅｓＹａｎｇｔｚｅｐａｒａｐｌａｔｆｏｒｍａｎｄＳｏｕｔｈＣｈｉｎａＣａｌｅｄｏｎｉａｎｆｏｌｄｂｅｌｔ（ｏｒＣａｔｈａｙｓｉａ）,ｉｓｓｉｔｕａｔｅｄｉｎｔｈｅｊｕｎｃｔｕｒｅｏｆ... 相似文献
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Li ZhongInstitute of Geology Chinese Academy of Sciences Beijing Sun YongchuanDepartment of Petroleum Geology China University of Geosciences Wuhan 《中国地质大学学报(英文版)》1997,(1)
ＲｅｓｅｒｖｏｉｒＤｉａｇｅｎｅｓｉｓＳｅｑｕｅｎｃｅａｎｄＦｒａｍｅｗｏｒｋｉｎＩｎｔｒａｃｏｎｔｉｎｅｎｔＲｉｆｔＢａｓｉｎ，ＥａｓｔＣｈｉｎａ＊ＬｉＺｈｏｎｇＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ... 相似文献
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ＳｅｑｕｅｎｃｅＳｔｒａｔｉｇｒａｐｈｉｃＦｅａｔｕｒｅｓｏｆＭｅｓｏｚｏｉｃ－ＣｅｎｏｚｏｉｃＮｏｎｍａｒｉｎｅＳｅｄｉｍｅｎｔｓｉｎＥａｓｔｅｒｎＣｈｉｎａ￥ＸｕＨｕａｉｄａ；ＷｅｉＫｕｉｓｈｅｎｇ（ＤｅｐａｒｔｒｍｅｎｔｏｆＥｎｅｒｇｙＲｅｓｏ... 相似文献
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S. G. Skublov I. S. Sedova V. A. Glebovitskii I. M. Gembitskaya L. M. Samorukova 《Geochemistry International》2010,48(12):1237-1245
This paper reports the results of chemical and structural study (electron microscopy and ion microprobe) of zircons from different-age
generations of migmatite leucosomes in the basement rocks and Kurumkan Formation within the Nimnyr block, Aldan shield. The
studied zircons show REE distribution pattern with a positive slope from LREE to HREE and positive Ce anomaly, which is typical
of magmatic zircons, but have elevated LREE contents, which implies their crystallization from migmatite melt with subsequent
fluid reworking. The transformations of the zircons were caused by fluid, which was separated during crystallization of the
last LILE-enriched portions of the melt and inherited the geochemical features of the host rock—leucosome. 相似文献
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The Role of Partial Melting and Fractional Crystallization in Determining Discordant Migmatite Leucosome Compositions 总被引：5，自引：4，他引：5
Anatectic migmatite leucosomes in the Quetico MetasedimentaryBelt (Superior Province) are discordant to the host rock layering.Two morphological varieties within the anatectic leucosome suiteare distinguished. The first type show little compositionalor textural variation either across, or along, the leucosomes.In contrast, the second variety exhibits both compositionaland textural variations in a single leucosome, typically withinternal cross-cutting relationships. Major-oxide contents varycomparatively little in the Quetico anatectic leucosome suite,but there is a considerable range in the incompatible element(REE, Hf, Zr, Y and Th) concentrations. In particular La contentsrange from 1.8 to 78.1 p.p.m. and the La/Yb ratios from 9.1to 101.9. Samples with high REE contents have negative Eu anomalies,whereas those with low total REE abundances have positive Euanomalies, which indicate that feldspar fractionation was importantin their petrogenesis. Three samples which have no Eu anomalies,and which are taken not to have experienced significant feldsparfractionation, are regarded as the closest approximation toa primary melt composition. Petrographic evidence indicates that only the most aluminousbulk compositions in the host rocks have melted, with cordieriteand biotite as the principal residual phases. Batch partialmelting models indicate that the three leucosomes without Euanomalies could have been derived from 40–80 per centpartial melting of the aluminous metasediments, but garnet musthave been a residual phase. Since the residuum from 40 per centpartial melting is more mafic than any of the rocks currentlyexposed in the area, it is concluded that the melting whichgave rise to the leucosomes occurred at greater depth. Crystallization models indicate that the observed range of leucosomecompositions can be derived by crystal fractionation of meltcompositions similar to the three leucosomes lacking Eu anomalies(i.e. the assumed primary melts). Samples with high abundancesof incompatible elements and negative Eu anomalies representfractionated melts, whereas those with low levels of REE andpositive Eu anomalies represent cumulates. Leucosome composition,morphology and texture can be related to crystallization history,notably the timing of crystallization with respect to leucosomeintrusion. In particular, those leucosomes that exhibit compositionaland textural zoning are interpreted to have undergone crystalfractionation during intrusion. Although a suite of migmatite leucosomes may be derived by partialmelting, it is concluded that the trace-element compositionof any particular leucosome depends, to a great extent, uponits segregation and crystallization history. Indeed, the primarymelt composition may not be preserved. 相似文献
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Palaeoproterozoic metasedimentary migmatite reflects the highest temperature parts of a regional aureole at Mt Stafford, central Australia, comprising rocks that experienced 500–800 °C at ≈3 kbar. Whole‐rock major element concentrations are correlated with Zr content, psammitic compositions having nearly twice the Zr content of pelitic compositions. Zirconium is concentrated in mesosome compared with leucosome. Zircon is largely detrital, mostly lacking any overgrowth contemporary with migmatite formation. Comparatively small proportions of micro‐zircon (<10 μm) in sub‐solidus rocks are mostly hosted by quartz and plagioclase. Much higher proportions (three to five times) of micro‐zircon in migmatite are hosted by prograde K‐feldspar, cordierite and biotite. T–X and P–T NCKFMASHTZr pseudosections constructed using thermocalc model the distribution of Zr between solid and silicate liquid phases. Half of the detrital zircon (~100 ppm Zr) is predicted to be dissolved into silicate liquid at ≈800 °C and all dissolved by 850 °C, if all zircon is involved in the equilibration volume. Melt segregation at relatively low temperature is predicted to enrich the residuum in Zr, consistent with the observed distribution of Zr between mesosome and leucosome. The limited development of metamorphic zircon rims or overgrowths at Mt Stafford is explained by three concurrent processes: (i) Zr liberated during prograde metamorphism formed micro‐zircon, rather than following the prediction that Zr will partition into silicate liquid; (ii) some detrital zircon was probably armoured by other rock‐forming minerals, reducing Zr content in the effective bulk rock composition; and (iii) small proportions of melt loss during migmatization removed Zr that otherwise would have been available to form metamorphic rims. 相似文献
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Origin and evolution of a migmatite 总被引：5，自引：0，他引：5
The development of a stromatic migmatite exposed east and southeast of Arvika (Western Sweden) is described in four stages beginning with the country rock and following evolution through three areas characterized by low, medium and high amounts of leucosomes (areas L, M, and H, respectively).The country rock is a paragneiss composed of thin, alternating fine- and coarse-grained layers. Composition of the layers varies from granitic (fine) to tonalitic (coarse layers).The bulk of the stromatic migmatite is composed of leucocratic layers of magmatic appearance (leucosomes) and darker layers of gneissic aspect (mesosomes). Petrographical and chemical data (given in the form of Niggli values and K2O/SiO2 diagrams) show a close relationship between the fine-grained paragneiss layers and the leucosomes on the one hand and between the coarse-grained layers and the mesosomes on the other.At relatively low temperatures only those gneiss layers with a suitable (granitic) composition are transformed into leucosomes. This process is interpreted to be due to recrystallization of the felsic minerals via partial melting and to the separation of biotite.With increasing metamorphism, leucosomes become broader and more frequent due to partial melting of layers with less suitable composition. Contacts between different generations of leucosome can be recognized in the form of relict melanosomes.These observations favour essentially isochemical melting, followed by later in-situ crystallization. This model of an isochemical layer-by-layer transformation is supported by the preferential formation of hornblende in leucosomes and relict melanosomes, as well as by almost identical compositions of migmatite and country-rock plagioclase. 相似文献
16.
侵入岩是铁法矿区影响煤矿生产的主要地质因素,根据矿区地质资料,阐述了侵入岩特征：区内侵入岩主要为辉绿岩和辉绿玢岩,岩体产状以岩床和岩墙居多,少量为岩株、岩盖及不规则小岩体;自北向南分布面积增大、岩体数目增多,岩体形态以大隆井田较为复杂;垂向上岩床以侵入阜新组4、7煤居多,在煤层顶板尤为发育。侵入岩形成于古近纪,岩浆侵入的深部通道为先存的北北东向断裂,浅部断层及地层埋深、围岩性质对侵入岩体具有控制作用。 相似文献
17.
MAGMATISM AND TECTONO-MAGMATIC EVOLUTION OF JINNING CYCLE OF EASTERN KUNLUN OROGENIC BELT1 JiangChunfa ,YangJingshui,FenBinggui,etal.OpeningclosingtectonicsofKunlunmountains[M] .Beijing:GeologicalPublishingHouse ,1992 .12 5～ 14 3(inChinesewithEnglishabstract) .
2 GuFengbao,WuXianglong,JiangChangyi.Hercynian—Indo SiniancycleGraniteassociationandtheirtectonicsettinginEastKunlun[J] .QinghaiGeology ,1996 ( 1) :18～ 30 .… 相似文献
18.
《Journal of African Earth Sciences》1999,28(3):693-702
Results of RbSr, PbPb and SmNd whole rock, Rbr biotite and PbPb zircon evaporation analyses are presented for certain granitoid rocks from the Johannesburg Dome. These data indicate that the granodiorite, granite and leucosome from migmatite were emplaced ∼ 3090 Ma ago, were genetically related and were derived primarily from a source between ∼ 3300 and ∼ 3500 Ma old. A portion of the granodiorite and granite might have been derived from a source between ∼ 4000 and ∼ 4300 Ma old. The tonalite was emplaced ∼ 3170 Ma ago and was derived from a source between 3.3 and 3.5 Ga old. RbSr biotite-whole rock ages, ranging between about ∼ 2614 and ∼ 2080 Ma, probably reflect complete resetting during differential uplift, erosion and cooling of the granitoid rocks in the Neoarchæan and Palæoproterozoic. If so, they apparently were not influenced by the emplacement of the ∼ 2060 Ma Bushveld Igneous Complex or the ∼ 2000 Ma Vredefort event. The granodiorite, granite and leucosome were emplaced coeval with and may be genetically related to compositionally similar plutonic and volcanic rocks in the Barberton area, Vredefort structure and Dominion Group. 相似文献
19.
The migmatite complex of the Magrish area is part of a large crystalline massif south of Elat. The mineralogical composition of the migmatites is very uniform. The components of the melanosome are biotite, quartz and plagioclase, with small amounts of garnet and very rarely sillimanite and those of the leucosome — quartz and plagioclase. On the basis of chemical composition of the migmatites and possible premigmatitic parent rocks, absence of orthoclase in the leucosome, similar composition of plagioclase in the leucosome and in neighbouring melanosome, and Qz:Plag values which do not plot around a cotectic line, it is concluded that migmatisation occurred in a nearly closed system, without the presence of a melt phase. Thus, injection of granitic material, metasomatism or partial anatexis as possible main formation mechanisms are rejected and metamorphic differentiation is favoured. 相似文献
20.
秦岭群中条带状混合岩质量等比线分析 总被引：4，自引：1，他引：4
对采自秦岭群中的五块条带状混合岩所作的质量等比线分析显示了两种情况：（１）古成体或围岩与脉体加暗色体确定的质量等比线揭示古成体或围岩是脉体加暗色体的原岩。脉体加暗色体有小的质量剩余，主要是Ｎａ＋Ｋ的带入，一块标本有Ｃａ的带出，而另一块标本有Ｆｅ的带出。后一标本的古成体与暗色体确定的质量等比线表明这类条带状混合岩的形成还涉及分异作用，它由分异作用和交代作用共同形成。（２）古成体与脉体加暗色体确定的质量等比线表明脉体加暗色体有大的质量剩余，剩余物质是花岗岩成分，没有物质的损失。这一情况存在两种解释：其一是原岩有不同的成分层，富长英质的成分层发育为脉体加暗色体；其二是原岩均匀，脉体加暗色体的形成中有大量外来物质的加入。本文倾向于第一种解释。 相似文献