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- W2371943223 abstract "This paper is a stage result of specia l research for“marble”in contact of Daye iron deposit and“banded pyroxene-garnet marble”distributed in the“marble”.According to traditional theory th at the quartz diorite intruded into limestone first,then marble wa s formed by contact metamorphism and skarns were formed by metasomatism i n this area.However,finding of melt i nclusions in skarn minerals from skarns and in carbonate minerals from“marble”compelled us to consider the truth of traditional theory in respect of int erpretation for formations of skarn and marble in Daye Jianshan district.The“marbles”protrude into quartz diorite in the s hape of dyke,apophysis and veinlets.A quartz diorite xenolith with 1.5m ×3m in the“marble”from the ore block has been found.According to data of trend surface an alyses made by Shi Zhun-li,et al .the contact zone between“marble”and quartz diorite is always characterized by“marble”protruding into quartz diorite.It i s seen that in the vicinity of the contact between the“marble”and limestone(wall rock),grain size of the calcite from the“marble”became fine due to high cooling rate of temperatu re and the limestone xenoliths existed in the“marble”.Light-colored“marble”is white and usually has oriented-fine ribbon structure(it is possible for the flow structure or linear feature caused by tectonic event )and its occurrence locally sharply c hanged.“Banded pyroxene-garnet marble”occurred in the“marble”within Jianshan ore block is distrib uted in a narrow range and is mainly ch aracterized by pyroxene-garnet bands,the strike of which bevels the extension direction of the“marble”.The distribution of the“banded pyroxene-garnet marble”is related to a group of fault structu res in this area.The observations un der microscope indicate that melt inclusions,flui d-melt inclusions and fluid inclusions are almost found in 65inclusion t hin sections.The results of heating exp eriments show that melt inclusions i n the calcite from the“marble”and in the calcite and the garnet from the“banded pyroxene-garnet marble”have approximate homogenization te mperatures of880～1055℃.Fluid-melt inclusions h ave homogenization temperatures of645～740℃.C and O isotopes of“marble”and the“banded pyroxene-garnet marble”are roughly consistent with the lime stone from lower-middle reaches of Yangtze River.Projectio n points of C and O isotopic data are all fallen into the range of sedimentary carbonate rocks in the C-O dependent diagram.Electron probe analysis re sults indicate that one melt inclusion in the calcite from the“banded pyroxene-garnet marble”has the composition of Si,Ca,Mg,Al,K-bearing mixture,namely glass.The compositions of th e round solid inclusion in calcite fr om“marble”are calcite and dolomite from“dolomite marble”are similar to the dolomite,but different from host mineral.“Marble”and“banded pyroxene-garnet marble”reported here are not marble formed b y the contact metamorphism,they pro bably are a new carbonatite type—crust-derived carbonatite of magma tic type based on preliminary studie s mentioned above." @default.
- W2371943223 created "2016-06-24" @default.
- W2371943223 creator A5005704069 @default.
- W2371943223 date "2004-01-01" @default.
- W2371943223 modified "2023-09-25" @default.
- W2371943223 title "A possible new carbonatite type:Cru st-derived carbonatite" @default.
- W2371943223 hasPublicationYear "2004" @default.
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