48283.juandefuca洋脊endeavour段熱液煙囪體的生長歷史和熱液演化的流體包裹體證據(jù)

1、中國科學院廣州地球化學研究所碩士學位論文JuandeFuca洋脊Endeavour段熱液煙囪體的生長歷史和熱液演化的流體包裹體證據(jù)姓名：吳雪枚申請學位級別：碩士專業(yè)：地球化學指導教師：周懷陽20070610AbstractGrowthhistoryofhydrothermalchimneysandfluid“：lusiqnevidenc‘forthedutionofhydrothermalfluidslnCluSionenceIortl

2、leevolut[Onol11UlslwithintheEndeavourSegment，JuandeFucaRidgeByWuXuemeiDirectedbyProfZhouHuaiyangAbstractPetrographicandfluidinclusionstudiesof9activechimneysamplesfromtheEndeavourSegmenthavebeencarriedout，toestablishthei

3、rformationenvironmentandgrowthhistoryThechimneyprecipitatesweredividedintofourdistinctgroupsaccordingtotheirmineralogyandmetalcontents：(1)Sulfaterichtype，(2)Znrichtype，(3)Fe—Znrichtype，(4)Cu—richtypeSulfaterichtypechimne

4、yfragmentsaremainlycomposedofanhydritewithminorsulfidesZn—richtypechimneysaremainlycomposedofwurtziteand／orsphalerite，characteristicallycontainthelow—temperaturemineralgalenaTheywereformedinthelowmediumtemperature，lessac

5、idic，Zn—richandreducingenvironmentPyrrhotiteandwurtzitearecommonmineralsinFeZnrichtypechimneysThistypechimneywasformedintherelativelymedium—hightemperature，acidic，morereducingenvironmentCurichtypechimneysaremainlycompose

6、dofchalcopyriteand／orcubaniteTheywereformedinthehightemperature，acidic，CurichandreducingenvironmentChimneysgrewfromtheprecipitationofanhydriteforthemixingofhotfluidsandcoldseawaterSubsequentlyCuFe—Znsulfidesdepositeddire

7、ctlyreplacedandrecrystallizedtoformdifferenttypechimneysTheparameterswimthegreatestpotentialimpactmineralsprecipitationarefluidcompositionandflowrates，temperature，redoxcondition，pH，andbiologicalactivityThedataobtainedfro