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SIMS Pb/Pb dating of Zr-rich minerals in lunar meteorites Miller Range 05035 and LaPaz Icefield 02224:Implications for the petrogenesis of mare basalt

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Science China Earth Sciences 2010年第3期53卷 327-334页

作者： hsu weibiao Faculty of Earth Sciences China University of Geosciences

Miller Range (MIL) 05035 and LaPaz Icefield (LAP) 02224 are unbrecciated lunar basalt meteorites. In this report, we studied their petrography and mineralogy and made in situ uranogenic Pb/Pb dating of Zr-rich minerals. Petrography and mineralogy of these two lunar meteorites are consistent with previous investigations. The zirconolite Pb/Pb age of MIL 05035 is 3851±8 Ma (2σ), in excellent agreement with previous reports. This age suggests that MIL 05035 could be paired with Asuka 881757, a low-Ti mare basalt meteorite. The magmatic event related to MIL 05035 was probably due to the late heavy impact bom- bardment on the moon around 3.9 Ga. One baddeleyite grain in LAP 02224 shows a large variation of Pb/Pb age, from 3109±29 to 3547±21 Ma (2σ), much older than the whole-rock age of the same meteorite (~3.02±0.03 Ga). The other baddeleyite grain in LAP 02224 has an age of 3005±17 Ma (2σ). The result indicates that the minimum crystallization age of LAP 02224 is ~3.55 Ga and the younger ages could reflect late thermal disturbance on U-Pb system.

关键词： Pb/Pb dating SIMS zirconolite and baddeleyite lunar meteorite low-Ti mare basalt

Ion Probe Study of Silicate Inclusions from Colomera (ⅡE) Iron Meteorite: the Rare Earth Element Perspective

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Acta Geologica Sinica(English Edition) 2004年第5期78卷 1060-1074页

作者： hsu weibiao CA 91125 California Institute of Technology China Division of Geological & Planetary Sciences Chinese Academy of Sciences Laboratory for Astrochemistry and Planetary Sciences Purple Mountain Observatory Nanjing 210008 Pasadena USA

Coupled with a petrographical study, I carried out an ion probe study of rare earth element microdistributions in mineral phases of silicate inclusions from the Colomera ⅡE iron meteorite. Most mineral grains have homogeneous REEs, but show considerable inter-grain variations by a factor of 2 to 100. The whole rock REE abundances for Colomera, estimated by combining REE data with modal abundances, are relatively LREE-enriched with REEs of -10’CI, which suggest that Colomera silicates were highly differentiated and might represent a low degree partial melt (-10%) of a chondritic source. REE geochemistry of Colomera silicate inclusions points to an origin that involves differentiation, dynamic mixing, remelting, reduction, recrystallization, and subsequent rapid cooling near the surface of a planetary body.

关键词： ion probe rare earth elements Colomera silicate inclusions ⅡE iron meteorites

Geochemistry and origin of tektites from Guilin of Guangxi,Guangdong and Hainan

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Science China Earth Sciences 2011年第3期54卷 349-358页

作者： LIN Su GUAN YunBin hsu weibiao Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China Graduate School of Chinese Academy of Sciences Beijing 100049 China Division of Geological and Planetary Sciences California Institute of Technology Pasadena CA 91125 USA State Key Laboratory of Geological Processes and Mineral Resources and Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China

Six tektites from Guilin of Guangxi, Hainan, and Guangdong were analyzed for the abundances of major elements and 27 trace elements. All samples are splash-form tektites and have SiO2 contents ranging from 73.1wt% to 76.0wt% (74.6wt% on average). The chemical compositions, except Cr and Ni, of tektites from different areas, are similar. Guangdong tektite shows enrichments of Ni and Cr contents by a factor of 3, and has slightly higher MgO and FeO than Hainan and Guilin tektites. It indicates that the tektites were formed by mixing several target rocks. The major and trace element concentrations of southern China tektites closely resemble previously reported data for average splash-form and Muong Nong-type indochinites, indicating that they have the same source. (La/Lu)CI (7.99), Zr/Hf (35.45 on average), Ba/Rb (3.59 on average), and the rare earth element (REE) contents of tektites are similar to those of typical post Archean upper crustal rocks. This study suggests that the best fit for the target source of southern China tektites could be a combination of 41% shale, 2% sandstone, 20% greywacke, and 37% quartzite.

关键词： tektites southern China Australasian source rock Post-Archean sedimentary rock

Petrology,Mineralogy and Geochemisty of Antarctic Mesosiderite GRV 020175:Implications for Its Complex Formation History

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Acta Geologica Sinica(English Edition) 2010年第3期84卷 528-542页

作者： WANG Linyan hsu weibiao MA Changqian Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China Purple Mountain Observatory Nanjing 210008 China

GRV 020175 is an Antarctic mesosiderite,containing about 43 vol%silicates and 57 vol% *** occurs in a variety of textures from irregular large masses,to veins penetrating silicates, and to matrix fine *** metallic portion contains kamacite,troilite and minor *** weathering is evident as partial replacement of the metal and troilite veins by Fe *** phases exhibit a porphyritic texture with pyroxene,plagioclase,minor silica and rare olivine phenocrysts embedded in a fine-grained *** matrix is ophitic and consists mainly of pyroxene and plagioclase *** orthopyroxene phenocrysts occur as euhedral crystals with chemical zoning from a magnesian core to a ferroan overgrowth;others are characterized by many fine inclusions of plagioclase *** has almost inverted to its orthopyroxene host with augite lamellae, enclosed by more magnesian *** occurs as subhedral crystals,surrounded by a necklace of tiny chromite grains（about 2-3μm）.Plagioclase has a heterogeneous composition without zoning. Pyroxene geothermometry of GRV 020175 gives a peak metamorphic temperature（～1000℃） and a closure temperature（～875℃）.Molar Fe/Mn ratios（19-32） of pyroxenes are consistent with mesosiderite pyroxenes（16-35） and most plagioclase compositions（An_（87.5_96.6）） are within the range of mesosiderite plagioclase grains（An_（88-95））.Olivine composition（Fo_（53.8）） is only slightly lower than the range of olivine compositions in mesosiderites（Fo_（55-90））.All petrographic characteristics and chemical compositions of GRV 020175 are consistent with those of mesosiderite and based on its matrix texture and relatively abundant plagioclase,it can be further classified as a type 3A ***, penological,and geochemical studies of GRV 020175 imply a complex formation history starting as rapid crystallization from a magma in a lava flow on the surface or as a shallow *** primary igneous crysta

关键词： mesosiderite metal-silicate mixing thermal metamorphism formation history Antarctica

KREEP-rich breccia in Chang'E-5 regolith and its implications

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Science China Earth Sciences 2023年第11期66卷 2473-2486页

作者： Aoxin MEI Yun JIANG Shiyong LIAO Jinting KANG Fang HUANG weibiao hsu CAS Key Laboratory of Planetary Sciences Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230026China CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Institute of Deep Space Sciences Deep Space Exploration LaboratoryHefei 230026China

Lunar breccias provide crucial insights into the lithological diversity,shock processing and evolution of the lunar ***,we report a unique regolith breccia(CE5C0000YJYX070GP,hereafter CE5C)returned from the Chang'E-5(CE-5)***5C is one of the largest CE-5 breccias with a wide variety of lithologies,dominated by basaltic and mineral fragments as well as impact-melted clasts(including mid-Ti glasses,high-Al glasses,and crystal-bearing impact melt clasts).A comprehensive study of petrology and mineralogy on several representative clasts was conducted by integrating Scanning Electron Microscopy(SEM),Tescan Integrated Mineral Analysis(TIMA),Electron Probe Microanalysis(EPMA)and Laser Ablation Inductively Coupled Plasma Mass Spectrometry(LA-ICP-MS)*** is sufficient that CE5C is a mixed mare-highland regolith breccia,with a high percentage of KREEPy material(>20 vol.%),which has not been previously reported in other CE-5 *** mid-Ti impact glasses are characterized by high FeO(24.0 wt.%)and intermediate TiO_(2)(5.5 wt.%)contents,while the high-Al impact glasses have a chemical composition compatible with *** with the regional geological context of the CE-5 landing site,we propose that CE5C is likely derived from a mixed region between the P58/Em4 mare unit and its contiguous eastern *** the difficulty in assessing the representativeness of CE5C,the substantial presence of KREEPy material may provide valuable clues to the provenance of exotic ejecta,including the identification of unrecognized source craters situated in the eastern periphery of the sampling unit.

关键词： Chang'E-5 Regolith breccia Impact glasses KREEP Mare basalts

Hydrogen isotope geochemistry of lherzolitic shergottite in Martian meteorite GRV99027 from the Grove Mountains in Antarctica

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Chinese Science Bulletin 2006年第16期51卷 2001-2005页

作者： WANG Henian hsu weibiao GUAN Yunbin LIANG Ying State Key Laboratory for Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China Laboratory for Astrochemistry and Planetary Sciences Purple Mountain Observatory Nanjing 210008 China Department of Geological Sciences Arizona State University Tempe Arizona 85287 USA

Hydrogen isotopic composition was measured using an ion microprobe for lherzolitic shergottite in Martian meteorite GRV 99027 from the Grove Mountains in Antarctica. The D/H ratios of phosphate whitlockites were analyzed and water concentrations of tested points were calculated. The result show that their δ D values vary from +1300‰ to +4700‰, and water contents from 0.04 wt% to 0.43 wt%. Comparing the results with the hydrogen isotopic compositions of whole rock, hydrous miner- als and phosphates in SNC meteorites indicates that water highly enriched in deuterium is a unique feature of Martian meteorites, especially the phosphates prominent. It is interpreted as the result of isotopic exchange between magmatic water and Martian crustal fluids. The high D/H ratios observed in GRV 99027 phosphates indicate that they have hydrogen isotopic compositions similar to those of apatite in other Martian meteorites. The results further con- firmed the association of GRV 99027 with the Martian meteorite group.

关键词：南极洲火星陨星辉熔长石氢同位素离子显微探针

In situ SIMS oxygen isotope analyses: Evidence for the formation of aluminum-rich chondrules from ordinary chondrites

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Science China Earth Sciences 2015年第9期58卷 1748-1757页

作者： JIANG Yun hsu weibiao GUAN YunBin WANG Ying Key Laboratory of Planetary Sciences Purple Mountain Observatory Chinese Academy of Sciences Division of Geological and Planetary Sciences California Institute of Technology

Aluminum-rich chondrules （ARCs）, which share mineralogic and chemical properties with both Ca, Al-rich inclusions （CAIs） and ferromagnesian chondrules, play an important role in revealing their temporal and petrogenetic relationships. In this work, seven ARCs were found in three ordinary chondrites GRV 022410 （H4）, GRV 052722 （H3.7） and Julesburg （L3.6）. They contain bulk Al2O3 - 17%-33% and exhibit igneous textures composed of olivine, high- and low-Ca pyroxene, plagioclase, spinel and glass. In situ SIMS analyses show that ARCs have oxygen isotopic compositions （δ18O=-6.1‰-7.1‰; δ17O= -4.5‰-5.1‰） close to ferromagnesian chondrules but far more depleted in 160 than CAIs （δ18O=-40‰; δ17O=-40‰）. Most ARCs plot close to the terrestrial mass fractionation （TF） line, and a few between the TF and carbonaceous chondrite anhydrous mixing （CCAM） lines. Plagioclase, nepheline and glass suffered O-isotopic exchanges during the metamorphism processes in the parent body. Spinel, olivine and pyroxene represent the primary O-isotopic compositions of ARCs, and define a fitted line with a slope of- 0.7±0.1. Compared with the results of previous studies, shallower slope as well as more depleted 160 compositions further demonstrates that ARCs in ordinary chondrites are not a simple mixing product of ferromagnesian chondrules and CAIs. Instead, they probably experienced higher-degree oxygen isotope exchange with a δ6O-poor nebular gas reservoir during multiple melting episodes.

关键词： O-isotope SIMS Al-rich chondrule ordinary chondrite Antarctic meteorite

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Mineral chemistry and 3D tomography of a Chang’E 5 high-Ti basalt:implication for the lunar thermal evolution history

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Science Bulletin 2022年第7期67卷 755-761页

作者： Yun Jiang Ye Li Shiyong Liao Zongjun Yin weibiao hsu Key Laboratory of Planetary Sciences Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230026China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Paleontology&Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008China

In December 2020, Chang’E-5(CE-5), China’s first lunar sample return mission, successfully collected samples totaling 1731 g from the northern Oceanus Procellarum. The landing site was located in a young mare plain, a great distance from those of Apollo and Luna missions. These young mare basalts bear critical scientific significance as they could shed light on the nature of the lunar interior(composition and structure) as well as the recent volcanism on the Moon. In this article, we investigated a CE-5 basalt sample(CE5 C0000 YJYX065) using a combination of state-of-art techniques, including high resolution X-ray tomographic microscopy(HR-XTM), energy dispersive X-ray spectroscopy(EDS)-based scanning electron microscope(SEM), and electron probe microanalysis(EPMA) to reveal its 3 D petrology and *** results show that this sample has a fine-to medium-grained subophitic texture, with sparse olivine phenocrysts setting in the groundmass of pyroxene, plagioclase, ilmenite and trace amounts of other phases. It has an extremely high ilmenite modal abundance(17.8 vol%) and contains a significant amount(0.5 vol%) of Ca-phosphate grains. The mineral chemistry is in excellent agreement with that of Apollo and Luna high-Ti basalts. The major phase pyroxenes also display strong chemical zoning with compositions following the trends observed in Apollo high-Ti basalts. Based on current data, we came to the conclusion that CE5 C0000 YJYX065 is a high-Ti mare basalt with a rare earth element(REE) enriched signature. This provides a rigid ground-truth for the geological context at the CE-5 landing site and clarifies the ambiguity inferred from remote sensing surveys.

关键词： Chang’E-5 High-Ti basalt Mare basalt High resolution X-ray tomographic microscopy(HR-XTM) Lunar return sample

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新疆发现世界最长陨石雨--阿勒泰陨石雨

科学通报 2016年第25期61卷 2834-2842页

作者：王科超徐伟彪中国科学院行星科学重点实验室紫金山天文台南京210008 中国科学院大学研究生院北京100049 澳门科技大学太空科学研究所中国澳门

2011年在新疆阿勒泰地区发现了一块特大铁陨石,乌希里克(Wuxilike),重5 t.该陨石的主要矿物是铁纹石、镍纹石和合纹石,副矿物有陨磷铁镍石、陨碳铁(haxonite)、陨硫铁和陨硫铬铁矿,与同一地区发现的新疆铁陨石(Armanty)和乌拉斯台(Ulasi... 详细信息

2011年在新疆阿勒泰地区发现了一块特大铁陨石,乌希里克(Wuxilike),重5 t.该陨石的主要矿物是铁纹石、镍纹石和合纹石,副矿物有陨磷铁镍石、陨碳铁(haxonite)、陨硫铁和陨硫铬铁矿,与同一地区发现的新疆铁陨石(Armanty)和乌拉斯台(Ulasitai)铁陨石相一致.微量元素地球化学分析显示乌希里克与新疆铁陨石和乌拉斯台铁陨石是成对陨石,同属ⅢE群.三块铁陨石来源于同一母体,在其穿过地球大气层时,发生爆炸后散落开来,陨石分布范围长达425 km,远远超过了曾被公认为世界第一长陨石雨,纳米比亚的Gibeon陨石雨(长轴长275 km).国际陨石学会最近已正式批准把包括新疆铁陨石(Armanty)、乌拉斯台(Ulasitai)和乌希里克(Wuxilike)在内的陨石统称为阿勒泰陨石雨(Aletai).该陨石雨的确定对研究小行星轨道的演化和撞击地球的历史有重要启示作用.

关键词：阿勒泰铁陨石 ⅢE群陨石雨