Earth and Planetary Science最新文献

A Catalogue of Historical and Instrumentally-Recorded Ms ≥ 7 Earthquakes in Taiwan 台湾历史上和仪器记录的 Ms ≥ 7 级地震目录

Earth and Planetary Science Pub Date : 2024-07-01 DOI: 10.36956/eps.v3i2.1061

Jeen-Hwa Wang

引用次数: 0

2.13 Ga Lawsonite/Barroisite-Bearing E-Morb Signature Metagabbro Associated with Spinel Metaperidotite from Itaguara (São Francisco Craton, Brazil): Oldest Blueschist-Facies Fragment of Oceanic Moho? 与来自伊塔瓜拉（巴西圣弗朗西斯科克拉通）的尖晶石辉长岩有关的 2.13 Ga Lawsonite/Barroisite-Bearing E-Morb Signature Metagabbro：最古老的蓝晶-岩相大洋莫霍碎片？

Earth and Planetary Science Pub Date : 2024-06-14 DOI: 10.36956/eps.v3i2.1068

Alexandre De Oliveira Chaves

{"title":"2.13 Ga Lawsonite/Barroisite-Bearing E-Morb Signature Metagabbro Associated with Spinel Metaperidotite from Itaguara (São Francisco Craton, Brazil): Oldest Blueschist-Facies Fragment of Oceanic Moho?","authors":"Alexandre De Oliveira Chaves","doi":"10.36956/eps.v3i2.1068","DOIUrl":"https://doi.org/10.36956/eps.v3i2.1068","url":null,"abstract":"In close association with Paleoproterozoic retroeclogite and accretionary prism-related mica-quartz schist, a 2.13 Ga (metamorphic titanite U-Pb age) lawsonite/barroisite-bearing E-MORB signature metagabbro associated with spinel metaperidotite is found in the Itaguara Sequence from southern São Francisco craton, Brazil. Petrography and pressure-temperature equilibrium phase diagrams suggest that the metagabbro experienced blueschist-facies metamorphism, attaining peak metamorphic conditions at ~16 kbar and ~450 °C during subduction. The retrograde metamorphic path crossed epidote amphibolite-facies, in which the mineral assemblage found in metaperidotite (olivine, clinopyroxene, spinel, serpentine, chlorite, talc, and tremolite) was stable during a ca. 2.1 Ga continental collision-related exhumation that occurred between the Archean Campo Belo/Bonfim and Divinópolis complexes. This geological framework suggests that the metagabbro and adjacent spinel metaperidotite represent a subducted and exhumed blueschist-facies fragment of a Paleoproterozoic oceanic Mohorovičić (Moho) discontinuity, thus establishing the Itaguara metagabbro as the oldest-known occurrence of retrogressed blueschist and providing evidence for the activity of the modern-style plate tectonics more than 2 Gyr ago.","PeriodicalId":511557,"journal":{"name":"Earth and Planetary Science","volume":"13 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141338969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics of Multiplanetary Systems with One Host Star 有一颗主星的多行星系统的特征

Earth and Planetary Science Pub Date : 2024-06-07 DOI: 10.36956/eps.v3i2.1025

Elza Buslaeva, Elena Belenkaya

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Exciting Planetary Exploration, Planetary Science but also Earth Sciences 令人兴奋的行星探索、行星科学以及地球科学

Earth and Planetary Science Pub Date : 2024-05-06 DOI: 10.36956/eps.v3i1.1095

Albert Galy

引用次数: 0

Discovery of the Naturally Occurring Pure CaTiO3 Cubic Perovskite from Tazheran Massif 从塔齐兰山脉发现天然存在的纯 CaTiO3 立方透辉石

Earth and Planetary Science Pub Date : 2024-04-25 DOI: 10.36956/eps.v3i1.991

Jing Sun, Jin Liu, Fuyang Liu, Eugene Sklyarov, Ross Mitchell

{"title":"Discovery of the Naturally Occurring Pure CaTiO3 Cubic Perovskite from Tazheran Massif","authors":"Jing Sun, Jin Liu, Fuyang Liu, Eugene Sklyarov, Ross Mitchell","doi":"10.36956/eps.v3i1.991","DOIUrl":"https://doi.org/10.36956/eps.v3i1.991","url":null,"abstract":"As the parent compound of the perovskite-structured family and an analogue of davemaoite CaSiO3 in Earth’s lower mantle, CaTiO3 perovskite is widely used in electronic ceramic materials, immobilizing radioactive waste, and geosciences. Here we report the discovery of a natural pure CaTiO3 perovskite-C in calc-silicate veins in brucite marble in the Tazheran Massif, Russia. The mean composition of perovskite-C is 97 wt% total CaO and TiO2, and minor impurities of Na, Al, and Zr, yielding the chemical formula CaTi0.97Al0.01Na0.01Zr0.01O3. The cubic crystal structure—Pm3m, Z = 1: a = 3.8301 Å, V = 56.19 (2) Å3 (ρ = 4.019 g/cm3) has been refined to R1 = 0.0451. Compared with the cubic perovskite discovered in Israel, the cubic perovskite discovered in this study is very pure in Ca and Ti. The naturally occurring perovskite-C from Tazheran implies that the host skarn might have experienced high-temperature (> 1247–1374 °C) metamorphism and/or metasomatism at an early stage. Moreover, the discovery of natural perovskite-C also draws attention to considering crystal-structure-related matrix effects in the future of in situ U-Pb geochronology, especially using Tazh international perovskite standards.","PeriodicalId":511557,"journal":{"name":"Earth and Planetary Science","volume":"40 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140657000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crustal Structures Inferred from Combined Terrestrial and Earth Gravity Data beneath the Babouri-Figuil and Mayo Oulo-Lere Basins, North Cameroon and South Chad 从喀麦隆北部和乍得南部巴布里-菲吉尔盆地和马尤乌洛-勒雷盆地下的陆地和地球重力综合数据推断出的地壳结构

Earth and Planetary Science Pub Date : 2024-03-11 DOI: 10.36956/eps.v3i1.928

Bouba Saidou, Apollinaire Bouba, Valentin Oyoa, K. Njeudjang, J. Kamguia, Alidou Mohamadou

{"title":"Crustal Structures Inferred from Combined Terrestrial and Earth Gravity Data beneath the Babouri-Figuil and Mayo Oulo-Lere Basins, North Cameroon and South Chad","authors":"Bouba Saidou, Apollinaire Bouba, Valentin Oyoa, K. Njeudjang, J. Kamguia, Alidou Mohamadou","doi":"10.36956/eps.v3i1.928","DOIUrl":"https://doi.org/10.36956/eps.v3i1.928","url":null,"abstract":"In this work, the study of the crustal structure of the Babouri-Figuil and Mayo Oulo-Lere sedimentary basins was carried out through the interpretation of gravity data. These data were obtained by combining the terrestrial gravity data obtained from the Earth Gravitational Model 2008. The analysis of the terrestrial Bouguer anomaly maps reveals both negative and positive anomalies. Negative anomalies, i.e., low-density signatures, are interpreted as specific rock types on the basis of the geological knowledge of the region while the positive anomalies are attributed to basaltic rocks underlying a generally granitic environment. The empirical method was used to distinguish anomalies due to deep structures from those due to near-surface structures. This method testifies that the residual map of degree 4 is appropriate. Six profiles are drawn on this residual Bouguer anomaly map and are interpreted using spectral analysis and 2D modeling methods. The results indicate that the mean depths of mass sources at the near-surface of the Babouri-Figuil and Mayo Oulo-Lere sedimentary basins are located at 1.50 km and 1.55 km, respectively. Moreover, the Babouri-Figuil Basin is constituted of two formations while the Mayo Oulo-Lere Basin exhibits three distinct formations. These models also help clarify the geological structure of the study area as well as the thicknesses of the sedimentary basins.","PeriodicalId":511557,"journal":{"name":"Earth and Planetary Science","volume":"133 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140251386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Earth Radiation Pressure Physical Analytical Model on Satellite Laser Ranging Orbit Determination 地球辐射压力物理分析模型对卫星激光测距轨道确定的影响

Earth and Planetary Science Pub Date : 2024-01-28 DOI: 10.36956/eps.v3i1.967

Hao Yang, Xiaoya Wang, Yabo Li

{"title":"Impact of Earth Radiation Pressure Physical Analytical Model on Satellite Laser Ranging Orbit Determination","authors":"Hao Yang, Xiaoya Wang, Yabo Li","doi":"10.36956/eps.v3i1.967","DOIUrl":"https://doi.org/10.36956/eps.v3i1.967","url":null,"abstract":"SLR (Satellite Laser Ranging) is a kind of important space geodesy technique for the establishment of a Terrestrial Reference Frame (TRF) and determination of EOP (Earth Orientation Parameters). It determines the origin and scale factor of TRF. The accuracy of future TRF is 1 mm. This requires improving the SLR data processing accuracy and importing higher accuracy SLR satellite data. The Earth Radiation Pressure (ERP) is an important perturbation force for SLR satellites. The traditional Earth radiation pressure model for SLR satellites is the simple Cannon Ball model. This paper establishes the Box-Wing physical Earth radiation pressure model for SLR satellites and takes Lageos-1 as an example to evaluate the physical analytical model. The Lageos-1 is divided into two blocks: metal shell and corner reflectors. The area and optical characteristics of each block are analyzed according to the requirements of three kinds of Earth albedo and emissivity models of point source, experience and grid models. The results show that after importing the physical analytical Earth radiation pressure model, the empirical force acceleration in the T direction is significantly reduced and the orbit overlap arc precision is about 3 mm smaller than that of the original model. The orbit prediction results show that the prediction accuracy of the new Earth radiation pressure model has generally improved significantly. The maximum improvement percentage of the physical analytical model is 12%, 16%, 28% and 25% respectively in the prediction arc length of 1 day, 3 days, 5 days and 7 days. The physical grid model performs the best with the increase of prediction arc length.","PeriodicalId":511557,"journal":{"name":"Earth and Planetary Science","volume":"206 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140491512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0