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Transformation of olivine to diopside via interaction with carbonatite melts

Science China Earth Sciences 2023年第10期66卷 2332-2339页

作者： Jing WANG Ben-Xun SU sanjeewa p.k.malaviarachchi patrick Asamoah SAkYI prasanna L.DHARMApRIYA key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China Department of Geology Faculty of ScienceUniversity of PeradeniyaPeradeniya20400Sri Lanka Department of Earth Science School of Physical and Mathematical SciencesUniversity of GhanaLegon-AccraGhana

Numerous empirical and experimental studies have documented the consumption of orthopyroxene and production of clinopyroxene in mantle peridotite during carbonatite metasomatism,whereas little attention has been paid to whether and how olivine is compositionally modified through the same process of carbonatite metasomatism.Here,we present the discovery of well-preserved reaction features in olivine from typical calciocarbonatites from Sri Lanka.The olivine grains experienced serpentinization along the cracks and in their rims and are generally surrounded outwardly by serpentine,tremolite and diopside zones.The inner serpentine zone is dominated by serpentine with tiny magnetite,whereas the mantle tremolite zone is characterized by euhedral tremolite and intergrowth of dolomite with small amounts of serpentine relics and diopside.The outer diopside zone shows spongy texture and commonly encloses olivine,serpentine,tremolite and dolomite,which are also observed in interstitial diopside grains in the carbonatites.Compositional profile analyses reveal that these olivine grains display decreasing FeO and increasing MgO contents and thus elevating Fo values from their cores to the reaction rims,while the serpentine inherits compositions from the olivine.Elemental mapping images demonstrate outward diffusion of Si and Mg in the serpentine zones and contribution of Ca from carbonatite melts during tremolite formation.Further interaction with carbonatite melts produced Si-and Mg-poor and Ca-rich diopside relative to the reactant tremolite.These observations suggest that the interaction with carbonatite melts first transformed olivine to diopside through serpentinization,followed by tremolitization.The diopside formed through olivine-carbonatite melt interaction is anomalously depleted in Na and Al and enriched in Ca,which are distinct from those generated in interactions between orthopyroxene and both carbonatite and silicate melts.This implies that for the first time some wehrlites and clinopyroxenites in the mantle migh

关键词： Olivine Carbonatite Diopside Tremolite Melt-mineral interaction

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New constraints on the p-T path of HT/UHT metapelites from the Highland Complex of Sri Lanka

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Geoscience Frontiers 2017年第6期8卷 1405-1430页

作者： p.L.Dharmapriya sanjeewa p.k.malaviarachchi L.M.kriegsman Andrea Galli k.Sajeev Chengli Zhang postgraduate Institute of Science University of Peradeniya20400Sri Lanka Department of Geology Faculty of ScienceUniversity of Peradeniya20400Sri Lanka Naturalis Biodiversity Center Darwinweg 2NL-2333 CR LeidenThe Netherlands Department of Earth Sciences Utrecht UniversityBudapestlaan 4NL-3584 CD UtrechtThe Netherlands Department of Earth Sciences ETH ZurichSonnegstrasse 5CH-8092 ZurichSwitzerland Centre for Earth Sciences Indian Institute of ScienceBangalore 560012India key Laboratory of Continental Dynamics of Northwest University Department of GeologyNorthwest UniversityXi’an 710069China

We report here rare evidence for the early prograde p-Tevolution of garnet-sillimanite-graphite gneiss(khondalite)from the central Highland Complex,Sri Lanka.Four types of garnet porphyroblasts(Grt_1,Grt_2,Grt_3 and Grt_4)are observed in the rock with specific types of inclusion features.Only Grt_3 shows evidence for non-coaxial strain.Combining the information shows a sequence of main inclusion phases,from old to young:oriented quartz inclusions at core,staurolite and prismatic sillimanite at mantle,kyanite and kyanite pseudomorph,and biotite at rim in Grt_1;fibrolitic sillimanite pseudomorphing kyanite±corundum,kyanite,and spinel+sillimanite after garnet+corundum in Grt_2;biotite,sillimanite,quartz±spinel in Grt_3;and ilmenite,rulite,quartz and sillimanite in Grt_4.The pre-melting,original rock composition was calculated through stepwise re-integration of melt into the residual,XRF based composition,allowing the early prograde metamorphic evolution to be deduced from petrographical observations and pseudosections.The earliest recognizable stage occurred in the sillimanite field at around 575℃ at 4.5 kbar.Subsequent collision associated with Gondwana amalgamation led to crustal thickening along a p-T trajectory with an average dp/dT of ~30 bar/℃ in the kyanite field,up to ~660℃ at 6.5 kbar,before crossing the wet-solidus at around 675 ℃ at 7.5 kbar.The highest pressure occurred at p > 10 kbar and T around 780℃ before prograde decompression associated with further heating.At 825℃ and 10.5 kbar,the rock re-entered into the sillimanite field.The temperature peaked at 900℃ at ca.9-9.5 kbar.Subsequent near-isobaric cooling led to the growth of Grt_4 and rutile at T ~880℃.Local pyrophyllite rims around sillimanite suggest a late stage of rehydration at Tprobably occurred after uplift to upper crustal levels.U-pb dating of zircons by LAICpMS of the khondalite yielded two concordant ^(206)pb/^(238)U age groups with mean values of 542±2 Ma(MSWD=0.24,Th/U=0.01-0.03)and 514±3 Ma(MSWD=0.50,Th/U=0.01-0.05)interpr

关键词： prograde evolution Melt re-integration Highland Complex Sri Lanka UHT granulites

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Distinct metamorphic evolution of alternating silica-saturated and silica-deficient microdomains within garnet in ultrahigh-temperature granulites: An example from Sri Lanka

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Geoscience Frontiers 2017年第5期8卷 1115-1133页

作者： p.L.Dharmapriya sanjeewa p.k.malaviarachchi Leo M.kriegsman k.Sajeev Andrea Galli Y.Osanai N.D.Subasinghe C.B.Dissanayake postgraduate Institute of Science University of Peradeniya 20400 Sri Lanka Department of Geology Faculty of Science University of Peradeniya 20400 Sri Lanka Department of Geology Naturalis Biodiversity Center Darwinweg 2 2333 CR Leiden The Netherlands Department of Earth Sciences University of Utrecht NL-3584 CD Utrecht The Netherlands Center for Earth Sciences Indian Institute of Science Bangalore 560012 India Department of Earth Sciences ETH Zurich Sonnegstrasse 5 CH-8092 Zurich Switzerland Division of Earth Sciences Department of Environmental Changes Faculty of Social and Cultural Studies Kyushu University 744 Motooka Fukuoka 819-0395 Japan National Institute of Fundamental Studies Hantana Road Kandy Sri Lanka

Here we report the occurrence of garnet porphyroblasts that have overgrown alternating silica-saturated and silica deficient microdomains via different mineral reactions. The samples were collected from ultrahigh-temperature(UHT) metapelites in the Highland Complex, Sri Lanka. In some of the metapelites, garnet crystals have cores formed via a dehydration reaction, which had taken place at silicasaturated microdomains and mantle to rim areas formed via a dehydration reaction at silica-deficient microdomains. In contrast, some other garnets in the same rock cores had formed via a dehydration reaction which occurred at silica-deficient microdomains while mantle to rim areas formed via a dehydration reaction at silica-saturated microdomains. Based on the textural observations, we conclude that the studied garnets have grown across different effective bulk compositional microdomains during the prograde evolution. These microdomains could represent heterogeneous compositional layers(paleobedding/laminations) in the precursor sediments or differentiated crenulation cleavages that existed during prograde metamorphism. UHT metamorphism associated with strong ductile deformation, metamorphic differentiation and crystallization of locally produced melt may have obliterated the evidence for such microdomains in the matrix. The lack of significant compositional zoning in garnet probably due to self-diffusion during UHT metamorphism had left mineral inclusions as the sole evidence for earlier microdomains with contrasting chemistry.

关键词： UHT Metapelites Garnet Microdomains Highland Complex Sri Lanka

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predictive Value of the Neutrophil to Lymphocyte Ratio (NLR) to predict the Development of preeclampsia and pregnancy Induced Hypertension at 1p>stp> Trimester

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Open Journal of Obstetrics and Gynecology 2024年第4期14卷 547-559页

作者： pradeepa sanjeewa Department of Obstetrics and Gynaecology Post Graduate Institute of Medicine University of Colombo Colombo Sri Lanka

Introduction: Hypertensive disorder in pregnancy affects 4 to 6 percent of all pregnancies and carries risks for the both baby and the mother. Only a few groups of women who are at high-risk pregnancies are received prophylaxis Aspirin, more than 15 percent of women develop pre-eclampsia with a single minor risk factor. Methods: This descriptive cross-sectional study was conducted to compare the 1p>stp> trimester NLR value of normotensive, pregnancy induced hypertensive and pre-eclamptic pregnant women. The study was conducted with a sample of 416, antenatal patients who were admitted to ward 25, at Colombo North Teaching Hospital Ragama. Data was collected as separated three groups. NLR value was calculated separately and ANOVA test was used to analyze the 3 categorical data. post HOC test was done to assess the multiple comparison. Results: The prevalence rates of pregnancy induced hypertension and pre-eclampsia among the pregnant women were 8.6% and 5.7%. The mean NLR values of normotensive group was 2.708, pregnancy induced hypertensive group was 2.650 and pre eclamptic group was 3.789. There was a significant difference in NLR value between pre eclamptic group and other two groups with p value of Conclusion: The 1p>stp> trimester NLR value of pre eclamptic patients significantly increased compared to normotensive women.

关键词： pre-Eclampsia Neutrophil to Lymphocyte Ratio 1st Trimester

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Formation of Melt pocket in Mantle peridotite Xenolith from Western Qinling, Central China: partial Melting and Metasomatism

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Journal of Earth Science 2010年第5期21卷 641-668页

作者：苏本勋张宏福 patrick Asamoah Sakyi 秦克章刘平平英基丰汤艳杰 sanjeewa p.k.malaviarachchi 肖燕赵新苗毛骞马玉光 key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences State key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences Department of Earth Science University of Ghana Legon-Accra Ghana Research School of Earth Sciences The Australian National University Canberra Act 0200 Australia

Two types of melt pockets, closed melt pocket （CMp） and open melt pocket （OMp）, are recognized from the peridotite xenoliths entrained in the Cenozoic kamafugites in western Qinling （秦岭）, Central China. The Haoti （好梯） CMps have a mineral assemblage of olivine＋ clinopyroxene＋amphibole＋k- feldspar, whereas the Baiguan （白关） CMps are composed of olivine＋clinopyroxene＋Umenite＋carbonate. The components of the OMps are more complicated. In the Haoti OMps, there are olivine, ciinopyroxene, glass, low modal abundances of amphibole, k-feldspar （kfs）, Umenite, sulfide, chlorite, perovskite, chromite and phlogopite. The Baiguan OMps contain olivine, clinopyroxene, glass, chlorite and chromite. Compositionally, ofivines in the CMps and OMps are both apparently depleted in Ni, and those in the OMps are also depleted in Fe and Mg, and enriched in Ca compared to the primary ones. Ciinopyroxenes display large and systematical compositional variations between the CMps and OMps, particularly in Al, Cr, Na, Ca and Ti. Glasses are generally depleted in Si compared to the worldwide glasses in melt pockets, although they still have large variations. Amphiboles and k-feldspars have relatively restricted compositional variations. The petrographical observations and mineral chemistry suggest that the Haoti and Baiguan CMps were generated by the in-sitn decompression melting of orthopyroxenes, olivines and clinopyroxenes, and by the addition of minor external k-rich and Ca-rich melt/fluids. The OMps formed during the latest metasomatic event in the lithospheric mantle beneath the western Qinling.

关键词： mantle metasomatism melt pocket partial melting peridotite xenolith western Qinling.

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U-pb ages and Hf-O isotopes of zircons from Late paleozoic mafic-ultramafic units in the southern Central Asian Orogenic Belt:Tectonic implications and evidence for an Early-permian mantle plume

U-Pb ages and Hf-O isotopes of zircons from Late Paleozoic m...

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中国科学院地质与地球物理研究所第11届（2011年度）...

作者： patrick Asamoah Sakyi sanjeewa p.k.malaviarachchi Department of Earth Science University of GhanaP.O.Box LG 58Legon-AccraGhana Research School of Earth Sciences The Australian National UniversityBuilding 61Mills Road ActonCanberraAct 0200Australia

U-pb age and Hf-O isotope data of zircons from the mafic-ultramafic complexes and their related rhyolites and granites in the Eastern Tianshan and Beishan regions were obtained by SIMS and LA-ICpMS.The Hf-O isotopic composition and Hf model age of the zircons are closely related to their tectonic setting and formation age.The zircons from the mafic-ultramafic complexes in the Bogeda-Haerlike and Jueluotage belts have higherε(t) (+ 8-+ 17) and lowerδO(+ 4‰- + 6‰),whereas most of the zircons in the gabbros,granites and rhyolite from the Middle Tianshan Massif and Beishan Rift display lowerε(t)(0- + 8) and higherδO(+ 5‰- + 8‰). The positiveε(t) and relatively lowerδO values suggest that these mafic-ultramafic complexes were derived from depleted mantle which was subjected to subduction-related modification processes.The Hf isotopic composition of zircons in the granites has revealed that the growth of juvenile crust was also very significant in the southern margin of the Central Asian Orogenic Belt during the paleozoic.The Hf model ages of the analyzed zircons,together with the regional geology suggest that the Beishan area had a northward subduction,possibly from ca.900 Ma to ca.400 Ma,whereas the Eastern Tianshan had a south-directed subduction most likely from ca. 600 Ma to ca.310 Ma.Additionally,zircons with ca.280 Ma U-pb ages display wider and more scatteredε(t) andδO variations than the relatively older and younger ones,which further support the Early permian mantle plume model.

关键词： Central Asian Orogenic Belt Mafic-ultramafic complex Mantle plume U-pb-Hf-O isotope Zircon

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Geochemistry and geochronology of acidic rocks in the Beishan region,NW China:petrogenesis and tectonic implications

Geochemistry and geochronology of acidic rocks in the Beisha...

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中国科学院地质与地球物理研究所第11届（2011年度）...

作者： patrick Asamoah Sakyi sanjeewa p.k.malaviarachchi Department ofEarth Science University of GhanaP.O.Box LG 58Legon-AccraGhana Research School of Earth Sciences The Australian National UniversityBuilding 61Mills Road ActonCanberraAct 0200Australia

The dacites and granites from the Beishan region are characterized by highly-fractionated REE,enrichments in LILE,and depletion in Nb,Ta and Sr.The dacites contain zircons with ages ranging from 265 to 748 Ma.These features suggest that they were probably derived from the older lower continental crust and were later on subjected to significant crustal assimilation.The rhyolites,diorites and diabases,all of which share similar geochemical features such as trace element patterns,zircon U-pb ages of～280 Ma, positiveε(f) andε(f),high initial(Sr/Sr)i andδO‰values,were most likely derived from the juvenile crustal sources and subsequently experienced fractional crystallization and crustal contamination. These acidic igneous rocks(except dacites and granites) and coeval mafic-ultramafic intrusions form a bimodal igneous series.This implies that the Beishan region was a Late paleozoic rift probably developed in association with the early permian mantle plume activity in the Tarim Basin.

关键词： Beishan Central Asian Orogenic Belt Dacite Magmatism Rhyolite Zircon U-pb-Hf-O isotopes

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橄榄石-碳酸盐熔体相互作用生成透辉石的反应机制与意义

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中国科学:地球科学 2023年第10期53卷 2370-2377页

作者：王静苏本勋 sanjeewa pkmalaviarachchi patrick Asamoah SAkYI prasanna LDHARMApRIYA 中国科学院地质与地球物理研究所矿产资源重点实验室北京100029 中国科学院大学北京100049 Department of Geology Faculty of ScienceUniversity of PeradeniyaPeradeniya 20400Sri Lanka Department of Earth Science School of Physical and Mathematical SciencesUniversity of GhanaLegon-AccraGhana

大量天然样品分析和实验结果表明碳酸盐熔体-橄榄岩的反应是消耗斜方辉石、生成单斜辉石的过程.然而,在该过程中橄榄石是否以及如何发生成分上的改变却鲜有研究.本文对斯里兰卡典型钙质碳酸岩中具反应边结构的橄榄石进行了详细的矿物学... 详细信息

大量天然样品分析和实验结果表明碳酸盐熔体-橄榄岩的反应是消耗斜方辉石、生成单斜辉石的过程.然而,在该过程中橄榄石是否以及如何发生成分上的改变却鲜有研究.本文对斯里兰卡典型钙质碳酸岩中具反应边结构的橄榄石进行了详细的矿物学和地球化学分析.橄榄石颗粒的裂隙和边缘均发育了蛇纹石化,其反应边自内向外依次为蛇纹石、透闪石和透辉石带.内部蛇纹石带以蛇纹石为主,含少量磁铁矿;幔部透闪石带以透闪石和白云石共生为主,可见少量蛇纹石和透辉石;外部透辉石带呈海绵边结构,常包裹橄榄石、蛇纹石、透闪石和白云石,与碳酸岩中的粒间透辉石特征一致.橄榄石颗粒的剖面成分分析显示,从核到边FeO含量降低及MgO含量和Fo值升高,蛇纹石则继承了橄榄石的成分.面扫元素分布图指示Si和Mg在蛇纹石带中具有向外扩散的趋势,碳酸盐熔体中Ca的加入促进了透闪石的形成,而透闪石与碳酸盐熔体的进一步反应生成了贫Si、贫Mg、富Ca的透辉石.这些特征表明,在与碳酸盐熔体反应过程中橄榄石先后发生蛇纹石化和透闪石化,最后转变为透辉石.这些透辉石成分极其贫Na和Al而富Ca,与斜方辉石和碳酸盐或硅酸盐熔体反应形成的单斜辉石在成分上有明显区别.这一反应机制可能具有普遍意义,为异剥橄榄岩和单斜辉石岩的成因机制提供了新的解释.

关键词：橄榄石碳酸岩透辉石透闪石熔体-矿物相互作用

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Geochronologic-petrochemical studies of the Hongshishan mafic-ultramaflc intrusion,Beishan area,Xinjiang(NW China):petrogenesis and tectonic implications

Geochronologic-petrochemical studies of the Hongshishan mafi...

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中国科学院地质与地球物理研究所2012年度（第12届）...

作者： Benxun Su kezhang Qin patrick Asamoah Sakyi Dongmei Tang pingping Liu sanjeewa p.k.malaviarachchi Qinghua Xiao He Sun key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences State key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Earth Science University of GhanaP.O.Box LG 58Legon-AccraGhana Research School of Earth Sciences The Australian National UniversityBuilding 61Mills Road ActonCanberraACT 0200Australia

The Hongshishan mafic-ultramafic intrusion(SIMS zircon U-pb age 286.4±2.8 Ma) consists of dunite,clinopyroxene peridotite,troctolite,and gabbro.Major elements display systematic correlations.Trace elements have identical distribution patterns,including flat rare-earth element(REE) patterns with positive Eu anomalies and enrichments in large ion hthophile elements(LILE) but depletions in Nb and Ta,indicating fractional crystallization as a key factor in magmatic evolution. petrologic and geochemical variations in drill core samples demonstrate that minor assimilation and progressive magma mjectioiis were closely associated with Ni-Cu mineralization.Mass balance estimates and Sr-Nd isotopes reveal that the Hongshishan parental magmas were high-Mg and low-Ti tholeiitic basalts and were derived from a lithospheric mantle source that had been modified by subducted slab metasomatism before partial melting. Southward subduction of the palaeo-Tianshan-Junggar Ocean is further constrained by a compilation of inferred subduction-induced modifications of mantle sources in mafic-ultramafic intrusions distributed in the eastern Tianshan-Beishan area.Integrating the regional positiveεNd(t) granites,high-Mg and low-Ti basaltic magmas(mafic-ultramafic intrusions),and slightly later high-Ti basalts in NW China suggests that their petrogenesis could be attributed to permian mantle plume activities.

关键词： Beishau eastern Tianshan fractional crystallization mafic-ultramafic intrusions mantle plume

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The metasedimentary rocks from the eastern margin of the Tarim Craton:petrology,geochemistry,zircon U-pb dating,Hf isotopes and tectonic implications

The metasedimentary rocks from the eastern margin of the Tar...

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中国科学院地质与地球物理研究所2013年度（第13届）...

作者： Zhong-Mei Wang Chun-Ming Han Ben-Xun Su patrick Asamoah Sakyi sanjeewa p.k.malaviarachchi Song-Jian Ao Luo-Juan Wang State key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences Department of Earth Science University of Ghana Department of Geology Faculty of ScienceUniversity of Peradeniya State key Laboratory of Lithosphefic Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

The Dunhuang Block,located in the eastern Tarim Craton,widely exposes precambrian TTG gneisses and metamorphosed supracrustal rocks.A suite of metasedimentary rocks of the Dunhuang Group in the Hongliuxia area on the eastern margin of the Tarim Craton are characterized by moderate contents of quartz,plagiodase,and biotite,with minor amounts of garnet or kyanite,most of which have experienced strong deformation,resulting in welldeveloped amphibolite-facies foliations.The examined samples are characterized by moderate FeO+MgO and TiO contents,and AlO/SiO and kO/NaO ratios with low Chemical Index of Alteration(CIA)and high Index of Compositional Variability(ICV)values,suggesting that the protolith sediments originated from continental island arc environment.The U-pb ages of magmatic-type detrital zircons from the Hongliuxia metasedimentary rocks range between 2476 Ma and 1950 Ma,with a peak at 2417 Ma.Detrital zircons of metamorphic origin yielded an age peak at 1832 Ma,which may represent a tectono-thermal event in the paleoproterozoic,Considering that the main age populations of the analyzed samples are consistent with the tectono-thermal events in the Tarim Craton during the early paleoproterozoic,we propose that the Tarim Craton was possibly the major source for the protolith sediments of the metasedimentary rocks in the Hongliuxia area,Zircon Hf isotopic compositions (ε(t)=-5.8 to+2.9)suggest voluminous addition of juvenile materials to the crust and minor reworking of old materials in the eastern Tarim Craton during the Mesoarchean(T=2.8-2.9 Ga).The metasedimentary rocks of the Hongliuxia area provide dear constraints to the evolution of the Tarim Craton,A possible tectonic model is that multiple thermal events(～2.4 Ga,2.2 Ga,2.0 Ga and 1.8 Ga)occurred in the study area,and the time period of Mesoarchean was important for crustal growth in the eastern Tarim Craton,whereas the～1.83 Ga metamorphism might represent a thermal event assodated with the Tarim Craton within the supercontinent Columbia.

关键词： Tarim Craton Metasedimentary rocks provenance Zircon U-pb dating Hfisotopes

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