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first.st.ps in reconst.uct.ng Early Jurassic sea wat.r t.mperat.res in t.e Andean Basin of nort.ern Chile based on st.ble isot.pe analyses of oyst.r and brachiopod shells

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Journal of Palaeogeography 2020年第1期9卷 71-87页

作者： Mat.hias Albert. franz t.fürsich Nils Andersen Inst.t.t.für Geowissenschaft.n Christian-Albrechts-Universitat zu KielLudewig-Meyn-Straβe 1024118 KielGermany GeoZent.um Nordbayern Fachgruppe PalaoUmweltFriedrich-Alexander-Universitat Erlangen-NürnbergLoewenichstraβe 2891054 ErlangenGermany Leibniz Laborat.ry for Radiomet.ic Dat.ng and St.ble Isot.pe Research Christian-Albrechts-Universitat zu KielMax-Eyth-Straβe 1124118 KielGermany

t.e st.ble isot.pe(δ13 C,δ18 O)composit.on of a collect.on of Lower Jurassic brachiopods and oyst.rs from t.e Andean Basin of nort.ern Chile was *** result. allow t.e first.reconst.uct.on of absolut. wat.r t.mperat.res for several ammonit. zones in t.e Lower Jurassic of Sout. *** t.mperat.re record st.rt. wit. comparat.vely high values in t.e Lat. Sinemurian(average:27.0℃;Raricost.t.m Zone).Just.before t.e Sinemurian–Pliensbachian t.ansit.on,t.mperat.res dropped t. an average of 24.3℃.t.e lowest.t.mperat.re value in t.e dat.set.was recorded for a brachiopod shell of t.e lat.st.Pliensbachian Spinat.m Zone(19.6℃).No dat. are available for t.e Early t.arcian,but.result. for t.e lat. t.arcian show again comparat.vely warm condit.ons(average:24.4℃;t.ouarsense–Levesquei zones).Even t.ough more mat.rial and analyses are necessary t. corroborat. t.e recorded t.mperat.res,t.e present.dat.set.seems t. indicat. t.e global nat.re of t.e Lat. Pliensbachian Cooling *** cont.ast.t.e global warming during t.e t.arcian Oceanic Anoxic Event.has not.been recorded due t. a lack of Early t.arcian ***δ13 C record of brachiopods and oyst.rs document. a gradual increase in values represent.ng background *** shells were used for high-resolut.on st.ble isot.pe analyses and show seasonal t.mperat.re fluct.at.ons over a period of around 3 years in t.e life t.me of t.e *** explained only by t.mperat.res,t.eδ18 O values point.t. a minimum est.mat. for t.e seasonalit. in t.e lat. t.arcian of slight.y more t.an 3℃.

关键词： Early Jurassic Chile St.ble isot.pes Palaeoclimat. Wat.r t.mperat.res Seasonalit.

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Lat. Quat.rnary palaeoenvironment.l changes document.d by microfaunas and shell st.ble isot.pes in t.e sout.ern Pearl River Delt. plain,Sout. China

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Journal of Palaeogeography 2013年第4期2卷 344-361页

作者： Liu Chunlian franz t. fürsich Wu Jie Dong Yixin Yang t.ngt.ng Yin Jian Depart.ent.of Eart. Sciences Sun Yat-Sen University Geozent.um Nordbayern FG Pal oumwelt der Friedrich-Alexander-Universitt Erlangen Guangdong Provincial Key Laborat.ry of Mineral Resources and Geological Processes

Ahigh resolut.on st.dy of sediment.,microfaunas(ost.acods and foraminifers),and st.ble isot.pes of ost.acod shells from core PRD05,sampled from t.e Da’ao plain of t.e Pearl River Delt.,provides new dat. about.palaeoenvironment.l changes during t.e Lat. *** basal fluvial gravelly sediment. of t.e core,represent.ng t.e lowest.deposit. of t.e Quat.rnary at.t.e core sit.,were possibly formed prior t. t.e t.ansgression associat.d wit. t.e last.int.rglacial *** fluvial set.ing changed int. a marginal marine set.ing during t.e last.int.rglacial st.ge,any record of calcareous fossils were dest.oyed by subsequent.dissolut.on during t.e last.glacial phase,when t.e upper part.of t.e delt.ic sediment. experienced subaerial oxidat.on,indicat.d by a mot.led clay layer in t.e *** post.lacial sealevel rise in t.e Sout. China Sea began at.6,700 cal yr *** t.e first.phase of sea-level rise(from ~16,700 t. 10,100 cal yr B.P.),a swamp environment.developed at.t.e core *** ~10,100 cal yr B.P.,marine wat.rs int.uded ont. t.e Da’ao plain and reached t.e core sit. t.rough t.e Modaomen *** t.ming was earlier t.an in ot.er part. of t.e Pearl River *** t.en,a semi-enclosed est.arine environment.developed and was maint.ined unt.l ~5560 cal yr *** t.is t.ansgressive int.rval,short.t.rm environment.l fluct.at.ons can be recognized based on microfauna and shell geochemical *** ~10,100 t. 8630 cal yr B.P.,t.e sea-level rose,which was followed by a fall from ~8630 t. 8520 cal yr *** expanded t.ansgression occurred bet.een ~8520 and 7900 cal yr *** t.me int.rvals from ~8520 t. 8200 cal yr *** from ~8080 t. 7900 cal yr *** marked by peak *** ~7900 t. 5560 cal yr B.P.,t.e core sit. generally showed a reduced marine influence and enhanced freshwat.r input.A fluvial environment.developed from ~5560 t. 3100 cal yr B.P.,and was succeeded by an alluvial plain set.ing.

关键词： Lat. Quat.rnary microfauna shell st.ble isot.pes palaeoenvironment Pearl River Delt.

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Int.rbasinal marker int.rvals——A case st.dy from t.e Jurassic basins of Kachchh and Jaisalmer, west.rn India

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Science China Eart. Sciences 2009年第12期52卷 1924-1931页

作者： PANDEY Dhirendra Kumar fürsich franz t.eodor Depart.ent.of Geology University of Rajasthan Jaipur 302004 India Inst.t.t.für Geologie und Palont.logie der Universit.t.Würzburg Pleicherwall 1 D-97070 Würzburg Germany GeoZent.um Nordbayern der Universit.t.Erlangen Loewenichstr. 28 D-91054 Erlangen Germany

t.e Kachchh Basin and t.e Jaisalmer Basin are t.o neighboring Mesozoic sediment.ry basins at.t.e west.rn margin of t.e Indian crat.n. t.e Jurassic succession of t.e Kachchh Basin is more complet. and more fossiliferous t.an t.at.of t.e Jaisalmer Basin. Consequent.y, int.abasinal correlat.on of t.e sediment.ry unit. has been possible in t.e Kachchh Basin, but.not.in t.e Jaisalmer Basin. However, some marker beds exist.ng in t.e Kachchh Basin can be recognized also in t.e Jaisalmer Basin. Ammonit. evidence shows t.at.t.ey are t.me-equivalent. t.e following four unit. form marker int.rvals in bot. basins: (1) t.e pebbly rudst.ne unit.wit. Isast.ea bernardiana and Lept.sphinct.s of t.e Kaladongar format.on (Kachchh Basin) and t.e Isast.ea bernardiana-bearing rudst.ne of t.e Jaisalmer format.on (Jaisalmer Basin) bot. represent.t.ansgressive syst.ms t.act.deposit. dat.d as Lat. Bajocian; (2) biot.rbat.d micrit.s wit. anomalodesmat.n bivalves wit.in t.e Goradongar Yellow flagst.ne Member (Kachchh Basin) and biot.rbat.d unit. in t.e fort.Member (Jaisalmer Basin) represent.maximum flooding zone deposit. of t.e Middle t. Lat. Bat.onian; (3) t.ough-crossbedded, sandy packt. grainst.nes of t.e Raimalro Limest.ne Member (Kachchh Basin) and t.e basal limest.ne-sandst.ne unit.of t.e Kuldhar sect.on of t.e Jaisalmer format.on (Jaisalmer Basin) correspond t. Lat. Bat.onain t.ansgressive syst.ms t.act.deposit.; and (4) ferruginous ooid-bearing carbonat.s wit. hardgrounds of t.e Dhosa Oolit. member (Kachchh Basin) and t.e middle part.of t.e Jajiya Member (Jaisalmer Basin) are Oxfordian t.ansgressive syst.ms t.act.deposit.. t.e fact.t.at.in bot. basins similar biofacies prevailed during cert.in t.me int.rvals demonst.at.s a common cont.ol of t.eir deposit.onal hist.ry. As t.e t.o basins represent.different.t.ct.nic set.ings, t.e most.likely cont.olling fact.rs were t.e relat.ve sea-level changes produced by eust.t.c processes, a common subsidence hist.ry of t.e nort.west.rn margin of t

关键词： Jurassic int.rbasinal correlat.on marker beds sequence st.at.graphy India

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Sequence archit.ct.re of a Jurassic ramp succession from Gebel Maghara(Nort. Sinai,Egypt.:Implicat.ons for eust.sy

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Journal of Palaeogeography 2015年第3期4卷 305-330页

作者： Ahmed Awad Abdelhady franz t.eodor fürsich Geology Depart.ent Faculty of ScienceMinia University fG Pal?oumwelt Geozentrum Nordbayern der Universit?t Erlangen

t.e Jurassic succession at.Gebet.Maghara, Nort. Sinai, Egypt. represent. a mixed carbonat.-sit.cict.st.c sequence. Combining informat.on from bot. fossit. and rocks at.owed a pt.usibt. reconst.uct.on of t.e deposit.onat.environment. and of t.e basin evot.t.on. t.e Ju- rassic succession of Gebel Maghara was deposit.d on a ramp, and t.e archit.ct.re of t.e ramp facies was st.ongt. cont.ot.ed not.ont. by sea-revel changes but.at.o by ext.nsionat.t.ct.nics in connect.on wit. rift.ng of t.e t.t.ys, Nort. Gondwana. Seven t.ct.nicalt. modified t.irdorder sequences （DS 1-DS 7） have been recognized. t.e first.t.ree sequences （DS 1-DS 3）, ranging from t.e t.arcian t. t.e Bajocian, record sea invasion （int.rt.dat.t. shat.ow subt.da[lcondit.ons） across an int.acrat.nic area as a resut. of eust.t.c sea-fever changes during a quiescent.rift.st.ge. t.e remaining sequences （DS 4-DS 7） reflect.open marine mid t. out.r ramp set.ings. Non-marine condit.ons around t.e Bajocian-Bat.onian boundary, document.d by cat.che, represent.t.e maximum regression of t.e sea. During an act.ve ext.nsionat.st.ge, horst., which formert. act.d as barriers separat.ng t.e Maghara sub-basin from t.e main ocean, subsided. Subsequent.rejuvenat.on and react.vat.on of faut.s shift.d t.e homoct.nat.physiography of t.e ramp t. a dist.t.y st.epened ramp during t.e eart. Bat.onian, creat.ng a 200-m-t.ick det.aic wedge. SimiLar processes during t.e eart. Kimmeridgian creat.d a cat.irudit.-cat.arenit. succession of st.pe origin. t.e diversit. and t.e epifaunat.infaunat.percent.ge of t.e macrofauna dispt.y a cyct.c pat.ern which coincides more or t.ss wit. t.e sequence st.at.graphic archit.ct.re.

关键词： facies sequence st.at.graphy ramp ext.nsional basin Jurassic Gebel Maghara Egypt

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facies analysis and palaeoecology of t.e Jurassic Spit. Shale format.on in t.e Spit. area,Nort.ern India

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Journal of Palaeogeography 2021年第4期10卷 438-462页

作者： franz t.fürsich Mat.hias Albert. Dhirendra K.Pandey Ket.n Chaskar Suraj Bhosale fG Palaoumwelt GeoZentrum Nordbayern der Friedrich-Alexander-Universitat Erlangen-NürnbergLoewenichstrasse 2891054ErlangenGermany St.t. Key Laborat.ry for Mineral Deposit. Research School of Earth Sciences and EngineeringCentre for Research and Education on Biological Evolution and Environment and Frontiers Science Center for Critical Earth Material CyclingNanjing210023China Depart.ent.of Geology Under the School of EarthBiological and Environmental ScienceCentral University of South BiharSH 7Gaya-Panchanpur RoadVillage KarharaPost FatehpurGaya824236BiharIndia Depart.ent.of Eart. and Environment.l Science K.S.K.V.Kachchh UniversityBhuj370001India

t.e Spit. Shale format.on is a widely dist.ibut.d st.at.graphic unit.of t.e passive nort.ern margin of t.e Indian crat.n,deposit.d bet.een t.e Callovian and earliest.*** siliciclast.c st.at. are dominat.d by dark-grey t. black argillaceous *** t.e format.on has undergone int.nse t.ct.nic st.ess involving folding and fault.ng,it.is very difficult.t. document.a complet. *** t.e t.pe area,t.e Spit. Valley,six sect.ons have been measured t.at.document.part. of t.e t.ree informal members of t.e format.on,t.e Lower,Middle,and Upper *** it. uniform appearance,eight.facies/biofacies t.pes could be dist.nguished,ranging from t.e anoxic shale facies,wit. ammonit.s and belemnit.s as t.e only faunal element.,t. t.e dysoxic Malayomaorica and Bosit.a biofacies,and t.e oxic t. anoxic offshore shelf facies,which are charact.rized by low-diversit. macrobent.os *** facies are t.e condensed glauconit.cphosphorit.c mudrock facies and t.e fe-oolit.c silt.t.ne facies(bot. charact.rized by sediment.st.rvat.on),t.e aerat.d argillaceous silt.sandst.ne facies,and t.e t.de-influenced nearshore shelf *** bent.ic macrofauna represent. four bivalve-dominat.d associat.ons all charact.rized by a very low t. low species *** are t.e Bosit.a buchii,t.e Aust.alobuchia spit.ensis,t.e Palaeonucula cuneiformis-Pruvost.ella hermanni-Indogrammat.don egert.nianus,and t.e Malayomaorica sp.-Aust.alobuchia spit.ensis-Ret.oceramus haast. *** and macrobent.ic associat.ons indicat. t.at.t.e Spit. Shale format.on represent. out.r t. inner shelf environment.,which for much of t.e t.me were subject.d t. upwelling and anoxic t. dysoxic *** shallowing at.t.e t.p charact.rizes t.e t.ansit.on t. t.e overlying Lower Cret.ceous Giumal format.on.

关键词： Jurassic palaeoenvironment. Biofacies Macrobent.ic communit.es Black shales Deoxygenat.on Upwelling Himalayan mount.ins

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Recurrent.hardgrounds and t.eir significance for int.a-basinal correlat.ons:a case st.dy of upper Bat.onian rocks from t.e west.rn margin of t.e Indian crat.n

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Journal of Palaeogeography 2019年第1期8卷 19-30页

作者： Dhirendra K.Pandey franz t.fürsich Mat.hias Albert. Jit.ndra K.Sharma Narendra Swami Eart. and Planet.ry Sciences Group Manipal Center for Natural SciencesCentre of Excellence Dr. TMA Pai Planetarium Building Manipal Academy of Higher Education fG Pal?oumwelt GeoZentrum Nordbayern Friedrich-Alexander Universit?t Erlangen-Nürnberg Inst.t.t.für Geowissenschaft.n Christian-Albrechts-Universit?t zu Kiel Depart.ent.of Geology University of Rajasthan Himalayan Geology Division Geological Survey of India Northern Region

A set.of t.o t. t.ree prominent.hardgrounds can be t.aced for more t.an 40 km from east.t. west.wit.in t.e Jurassic succession of t.e Jaisalmer Basin at.t.e west.rn margin of t.e Indian Crat.n. t.e hardgrounds st.rt.d t. form under subt.dal condit.ons in a mixed carbonat.–siliciclast.c set.ing during t.e last.phase of a t.ansgressive syst.ms t.act. i.e. t.e maximum flooding zone. t.e age difference bet.een t.e hardgrounds is very small, but.t.ey differ lit.ologically. t.pically, t.e st.at.graphically oldest.hardground occurs at.t.e t.p of a 1-m-t.ick calcareous sandst.ne. It.is charact.rized by a spect.cular megaripple surface encrust.d wit. oyst.rs and subsequent.y occasionally bored by bivalves. t.e hardground is overlain by 10–25 cm of biowackest.ne t. biopackst.ne, at.t.e t.p of which anot.er hardground is developed. t.is second hardground is charact.rized by abundant.bivalve(Gast.ochaenolit.s isp.) and "worm" borings(t.ypanit.s and Meandropolydora isp.) and occasional oyst.r encrust.t.ons. t.e t.ird hardground can be found wit.in t.e overlying 60-cm-t.ick, biot.rbat.d, fossiliferous silt. marly packst.ne. It.shows common t. abundant.oyst.r encrust.t.ons and occasional borings t.get.er wit. reworked concret.ons. t.e individual hardground can be well recognized t.roughout.t.e basin based on lit.ology and biot.c component.. t.e second hardground(biowackest.ne t. biopackst.ne) wit. abundant.bivalve and worm borings is most.prominent.and widespread. Lit.ost.at.graphically, t.ese t.ree hardground surfaces belong t. t.e uppermost.part.of t.e Bada Bag Member of t.e Jaisalmer format.on. Based on ammonit.s, such as Perisphinct.s congener(Waagen), brachiopods, and corals, t.is int.rval of t.e Bada Bag Member has been assigned a lat. Bat.onian age. t.e ent.re succession above t.e first.hardground is biot.rbat.d up t. t.e overlying marly silt.of t.e Kuldhar Member of t.e Jaisalmer format.on, which is already Callovian in age. t.e charact.rist.c hardground lit.ologies, t.get

关键词： Hardgrounds St.at.graphy Palaeoenvironment Jurassic Jaisalmer Basin

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Hydroclimat. changes relat.d t. t.ermal st.t. of t.e t.opical Pacific in t.e nort.ern coast.of t.e Sout. China Sea since~8000 cal yr B.P.

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Journal of Palaeogeography 2022年第3期11卷 410-426页

作者： Yue-Qin Wu Xiao-Qiang Yang Jian Yin franz t.ürsich t.ng-Wei Zhang Chun-Lian Liu Guangdong Provincial Key Laborat.ry of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat-Sen UniversityZhuhai 519082Guangdong ProvinceChina Sout.ern Marine Science and Engineering Guangdong Laborat.ry(Zhuhai) Zhuhai 519082Guangdong ProvinceChina fG Paläoumwelt GeoZentrum Nordbayern der Friedrich-Alexander-Universität Erlangen-NürnbergErlangen 91054Germany

Under t.e complex influences including t.e monsoonal climat.s and t.opical hydrological cycle,t.e feat.res and forcing mechanisms of precipit.t.on changes in t.e t.opical monsoon regions remain *** nort.ern coast.of t.e Sout. China Sea(NCSCS),connect.ng t.e Sout. China Sea(SCS)and t.e Pearl River Est.ary(PRE),is a crit.cal area providing reliable t.opical precipit.t.on records and probing t.e possible forcing mechanism of t.opical precipit.t.on,benefit.ed from it. high deposit.on rat. and hydroclimat.c ***,δ^(18)O variat.ons of plankt.nic(δ^(18)O_(G).ruber)and bent.ic foraminifera(δ^(18)O_(C).lobat.lus)were invest.gat.d respect.vely t. reconst.uct.a high-resolut.on low-lat.t.de precipit.t.on record from t.e core 17NH-NC3 in t.e *** result. show a dist.nct.^(18)O difference bet.eenδ^(18)O_(G).ruber andδ^(18)O_(C).lobat.lus,not.only wit. respect.t. values,but.also wit. respect.t. t.ends in some t.me *** clear difference bet.een t.e plankt.nic and bent.ic foraminifera(Δδ^(18)O_(b-p))illust.at.s t.e significant.vert.cal salinit. *** t.e t.mporal t.end ofΔδ^(18)O_(b-p) indicat.s t.e degree of salinit. st.at.ficat.on variat.d since t.e *** assume t.at.t.e degree of st.at.ficat.on in t.e NCSCS was mainly cont.olled by t.opical precipit.t.on ***,t.e t.end ofΔδ^(18)O_(b-p) values could indicat. t.e t.mporal change of t.e t.opical *** precipit.t.on record of our research area is closely relat.d t. t.e t.opical at.osphere–ocean dynamics st.mulat.d by sea surface t.mperat.re(SSt.changes of t.e t.opical Pacific zone,analogous t. t.e El Niño–Sout.ern Oscillat.on(ENSO)*** t.e mid-Holocene(from 8260 t. 5180 cal yr B.P.),t.e sust.inable higherΔδ^(18)O_(b-p) values(>1.23‰)suggest.d a large amount.of precipit.t.on,point.ng t. a sust.ined st.t. of La Niña-like,which is associat.d wit. last.d higher difference bet.een West.rn SSt.and East.rn SSt.W-E SSt.gradient.in t.e equat.rial Pacif

关键词： St.ble oxygen isot.pe Globigerinoides ruber Cibicides lobat.lus Low-lat.t.de precipit.t.on ENSO Mid-Holocene

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Model wit. st.ong γ_4 t.violat.on

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Chinese Physics C 2008年第12期32卷 939-944页

作者： R. friedberg t. D. Lee Physics Depart.ent Columbia University New York NY 10027 U.S.A. China Cent.r of Advanced Science and t.chnology (CCASt.World Lab.) P.O. Box 8730

eAbst.act.We ext.nd t.e t.violat.ng model of t.e paper on ＂Hidden symmet.y of t.e CKM and neut.inomapping mat.ices＂ by assuming it. t.violat.ng phases X↑ and X↓ t. be large and t.e same, wit. X = X↑ = X↓. In t.is case, t.e model has 9 real paramet.rs： at. α↑,β↑,ξ↑,η↑t.for t.e t.quark sect.r, α↓,β↓,ξ↓,η↓, for t.e sect.r and a common X- We examine whet.er t.ese nine paramet.rs are compat.ble wit. t.n observables： t.e six quark masses and t.e four real paramet.rs t.at.charact.rize t.e CKM mat.ix （i.e., t.e Jarlskog invariant. and t.ree Eulerian angles）. We find t.at.t.is is possible only if t.e t.violat.ng phase X is large, bet.een -120^o t. -135^o. In t.is st.ong t.violat.ng model, t.e smallness of t.eJarlskog invariant. 3 × 10^-5 ismainly account.d for by t.e large heavy quark masses, wit. mc/mt.ms/mb≈0.02, as well as t.e near complet.overlap of t.and b quark, wit. （c｜b）=-0.04.

关键词： Jarlskog invariant CKM mat.ix st.ong γ4 t.violat.on

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Closed-form solut.ons for free vibrat.on of rect.ngular fGM t.in plat.s rest.ng on elast.c foundat.on

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Act. Mechanica Sinica 2016年第6期32卷 1088-1103页

作者： t. f. Xu Y. f. Xing Inst.t.t. of Solid Mechanics Beihang UniversityBeijing 100191 China China Academy of Launch Vehicle t.chnology R&D Cent.r Beijing 100076 China

t.is art.cle present. closed-form solut.ons for t.e frequency analysis of rect.ngular funct.onally graded mat.rial (fGM) t.in plat.s subject.d t. init.ally in-plane loads and wit. an elast.c foundat.on. Based on classical t.in plat. t.eory, t.e governing different.al equat.ons are derived using Hamilt.n's principle. A neut.al surface is used t. eliminat. st.et.hing-bending coupling in fGM plat.s on t.e basis of t.e assumpt.on of const.nt.Poisson's rat.o. t.e result.ng governing equat.on of fGM t.in plat.s has t.e same form as homogeneous t.in plat.s. t.e separat.on-of-variables met.od is adopt.d t. obt.in solut.ons for t.e free vibrat.on problems of rect.ngular fGM t.in plat.s wit. separable boundary condit.ons, including, for example, clamped plat.s. t.e obt.ined normal modes and frequencies are in elegant.closed forms, and present.formulat.ons and solut.ons are validat.d by comparing present.result. wit. t.ose in t.e lit.rat.re and finit. element.met.od result. obt.ined by t.e aut.ors. A paramet.r st.dy reveals t.e effect. of t.e power law index n and aspect.rat.o a/b on frequencies.

关键词： funct.onally graded mat.rial free vibrat.on Rect.ngular plat. Close form solut.ons Neut.al surface

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三水盆地古近系湖相沉积岩的氧、碳同位素地球化学记录及其环境意义

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沉积学报 2004年第1期22卷 36-40页

作者：刘春莲 franz t.fürsich 白雁杨小强李国强中山大学地球科学系广州510275 Inst.t.t.für Geologie und Pal-ont.logie

三水盆地古近系莘庄组顶部至土布心组红岗段的全岩碳酸盐稳定同位素分析结果表明其形成期间经历了多次环境变迁。根据碳酸盐氧、碳同位素比值及其相互关系的变化 ,可识别三次海水入侵期。其时δ18O值大幅度向正值漂移。而由于受有机质... 详细信息

三水盆地古近系莘庄组顶部至土布心组红岗段的全岩碳酸盐稳定同位素分析结果表明其形成期间经历了多次环境变迁。根据碳酸盐氧、碳同位素比值及其相互关系的变化 ,可识别三次海水入侵期。其时δ18O值大幅度向正值漂移。而由于受有机质降解的影响 ,相应时期的δ13 C均表现为低值。在不直接受海洋影响的湖相沉积阶段 ,δ18O与δ13 C的相关程度虽然未达到典型的封闭型湖泊水平 ,但仍呈现一定的正相关变化 (r =0 .6 5 ) ,表明其湖水滞留时间较长。而频繁出现的石膏薄层沉积也指示湖盆的封闭性较好。这些均表明这一时期的三水盆地可能是一周期性封闭型湖泊。其稳定同位素组成主要受制于蒸发量 /降雨量平衡的变化。而δ13 C比值往往还受有机质活动的控制 ,更多的是反映有机质生产力。

关键词：氧碳同位素碳酸盐湖相沉积古近系三水盆地

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