Comptes Rendus Geoscience最新文献_第6页

Effect of anorthite on granite phase relations: Experimental data and models 钙长石对花岗岩相关系的影响：实验数据和模型

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/j.crte.2019.10.001

Michel Pichavant , Catherine Weber , Arnaud Villaros

{"title":"Effect of anorthite on granite phase relations: Experimental data and models","authors":"Michel Pichavant , Catherine Weber , Arnaud Villaros","doi":"10.1016/j.crte.2019.10.001","DOIUrl":"10.1016/j.crte.2019.10.001","url":null,"abstract":"<div><p>New experimental data on the effect of anorthite (An) on liquidus phase equilibria in the system Qz–Ab–Or are presented. The data were obtained for 5 wt% An added to variable Qz/Ab/Or compositions at 300 MPa and under H<sub>2</sub>O-saturated conditions. Crystal–liquid equilibria were determined for 13 synthetic glass compositions made from gels in experiments performed between 660 and 750 °C in cold-seal pressure vessels. Forward and reversal experiments were systematically conducted on each composition to demonstrate equilibrium. A total of 51 charges was examined. Three crystalline phases, quartz, alkali feldspar and plagioclase appear on the H<sub>2</sub>O-saturated liquidus surface. The determined minimum liquidus 5 wt% An “piercing” point (39% Qz, 33% Ab, 28% Or) is shifted away from the Ab apex toward the Qz–Or sideline when compared with the An-free 300 MPa H<sub>2</sub>O-saturated minimum. This shift is of the same type as that observed at 100 MPa in the same system and at 200 MPa in a rhyolitic system. The new experimental results are used to test both empirical and thermodynamic models for silicic magmas. Empirical models reproduce reasonably well the new experimental data, although more sophisticated calculations schemes appear to be required to improve their accuracy. The new experimental results in the haplogranodiorite system are not well reproduced with the model of Holland and Powell (2001), mainly because plagioclase stability appears greatly enhanced in the model. Rhyolite-MELTS satisfactorily reproduces the Qz-, Pl- and Af-liquid phase equilibria, but model H<sub>2</sub>O solubilities are significantly lower and crystallization temperatures higher than in experiments.</p></div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.crte.2019.10.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42157265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Editorial board ENG 编辑委员会

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/S1631-0713(19)30142-7

引用次数: 0

Crystal clustering in magmas: Insights from HP–HT experiments 岩浆中的晶体聚类:来自高温高温实验的见解

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/j.crte.2019.10.004

Laurent Arbaret , Misha Bystricky , Patrick Launeau

引用次数: 2

Page de Sommaire 目录页

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/S1631-0713(19)30145-2

引用次数: 0

New aspects of magma storage and transfer 岩浆储存和转移的新方面

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/j.crte.2019.11.001

Bruno Scaillet, Laurent Arbaret, Fabrice Gaillard

引用次数: 0

Titanite: A potential solidus barometer for granitic magma systems 钛铁矿：花岗岩-岩浆系统的潜在固体晴雨表

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/j.crte.2019.09.002

Saskia Erdmann , Rucheng Wang , Fangfang Huang , Bruno Scaillet , Kai Zhao , Hongsheng Liu , Yan Chen , Michel Faure

{"title":"Titanite: A potential solidus barometer for granitic magma systems","authors":"Saskia Erdmann , Rucheng Wang , Fangfang Huang , Bruno Scaillet , Kai Zhao , Hongsheng Liu , Yan Chen , Michel Faure","doi":"10.1016/j.crte.2019.09.002","DOIUrl":"10.1016/j.crte.2019.09.002","url":null,"abstract":"<div><p>Constraining crystallization pressure and thus intrusion depth of granites in various geodynamic settings remains challenging, yet important to further our understanding of magma system and crustal evolution. We propose that titanite, which is a common accessory in metaluminous and weakly peraluminous granites, can be used as a barometer if it crystallized in magmatic, near-solidus conditions and in equilibrium with amphibole, plagioclase, K-feldspar, quartz, biotite, and magnetite ± ilmenite. Titanite Al<sub>2</sub>O<sub>3</sub> increases with pressure (<em>P</em>) according to: <em>P</em> (in MPa) = 101.66 × Al<sub>2</sub>O<sub>3</sub> in titanite (in wt%) + 59.013 (<em>R</em><sup>2</sup> = 0.83) with estimated uncertainties of ~±60 to ~±100 MPa for crystallization between ~150 and 400 MPa. We highlight that the current calibration dataset is limited, and that systematic experimental studies are needed to rigorously quantify the relation. The most important use of this empirical barometer will be for rocks in which amphibole is present but significantly altered, or in combination with amphibole barometry, as titanite can be easily dated by LA-ICP-MS.</p></div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.crte.2019.09.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43983481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

A new 3D laser-scanning and GPS combined measurement system 一种新型三维激光扫描与GPS联合测量系统

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-10-01 DOI: 10.1016/j.crte.2019.09.004

Liang Li , Xingyan Cao , Qiang He , Jie Sun , Bingsong Jia , Xiang Dong

{"title":"A new 3D laser-scanning and GPS combined measurement system","authors":"Liang Li , Xingyan Cao , Qiang He , Jie Sun , Bingsong Jia , Xiang Dong","doi":"10.1016/j.crte.2019.09.004","DOIUrl":"10.1016/j.crte.2019.09.004","url":null,"abstract":"<div><p>Terrestrial laser scanning (TLS) is widely used because of its ability to quickly acquire high-density and high-precision 3D image and topographic data. However, it can only acquire independent coordinate system points, which restricts its application in large-scale deformation monitoring. In this study, we constructed a measurement system to acquire global coordinate point cloud data by combining TLS and GPS (Global Positioning System). The coordinate values of retro-reflective targets could be acquired in different coordinate systems, the GPS coordinate and the TLS station coordinate, synchronously. Our experiments showed that, after registration with the homonymy points acquired by 30-min short-baseline differential GPS using the ICP algorithm, the positional accuracy of the TLS retro-reflective target center in the global coordinate was better than 10 mm. This high precision meets, for instance, the requirements of coal mining subsidence monitoring. We used our new combined measurement system to acquire and process the point cloud data of a frame structure. The measurements demonstrated the practicability and robustness of the new measurement system.</p></div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.crte.2019.09.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44455035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Use of the magnetic, geochemical, and sedimentary records in establishing paleoclimate change in the environment of Sebkha: Case of the Sebkha Mhabeul in southeastern Tunisia 利用磁、地球化学和沉积记录建立Sebkha环境的古气候变化:以突尼斯东南部Sebkha Mhabeul为例

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-10-01 DOI: 10.1016/j.crte.2019.10.003

Mariem Ben Ameur , Sameh Masmoudi , Abdelhakim Abichou , Mounir Medhioub , Chokri Yaich

{"title":"Use of the magnetic, geochemical, and sedimentary records in establishing paleoclimate change in the environment of Sebkha: Case of the Sebkha Mhabeul in southeastern Tunisia","authors":"Mariem Ben Ameur , Sameh Masmoudi , Abdelhakim Abichou , Mounir Medhioub , Chokri Yaich","doi":"10.1016/j.crte.2019.10.003","DOIUrl":"10.1016/j.crte.2019.10.003","url":null,"abstract":"<div><p>In this study, we explored the evidence of late Holocene climate changes in southern Tunisia, examining extreme events of flood and sandstorm sedimentary succession records, in Sebkha Mhabeul. A sediment-derived climatic proxy was inferred from a 93.5-cm-deep core (Mh1), whose dating by tephrochronology has already been achieved in previous works. Multiple geochemical, sedimentological, magnetic susceptibility, and quartz grain microtexture proxies were used to determine the shifts in regional climatic conditions. The Sebkha core captured sensitive changes in the precipitation/evaporation (P/E) balance by adjustments in salinity, and is especially valuable for reconstructing variability over centennial timescales. The Sebkha Mhabeul area showed higher salinity during the Roman Warm Period (RWP: 2100–1400 cal yr BP), the Medieval Warm Period (MWP: 1000–600 cal yr BP) and the present era, and generally lower salinity during the Dark Ages (DA: 1400-1000 cal yr BP) and the Little Ice Age (LIA: 600-200 cal yr BP).</p><p>In southeastern Tunisia, the hydrological behavior was sometimes consistent with the flood activities in the eastern Mediterranean, and sometimes contemporaneous with the flood pulsations of the western Mediterranean.</p></div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.crte.2019.10.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43440638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Developments in the stratigraphy of the Deccan Volcanic Province, peninsular India 印度半岛德干火山省地层学的发展

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-10-01 DOI: 10.1016/j.crte.2019.10.002

Omkar Verma , Ashu Khosla

{"title":"Developments in the stratigraphy of the Deccan Volcanic Province, peninsular India","authors":"Omkar Verma , Ashu Khosla","doi":"10.1016/j.crte.2019.10.002","DOIUrl":"10.1016/j.crte.2019.10.002","url":null,"abstract":"<div><p>The Deccan Volcanic Province has been considered as one of the largest magmatic regions, involving an aerial coverage of ca. 500,000 km<sup>2</sup>. It is subdivided into four sub-provinces, and holds a unique position in global tectonic models for understanding earth's geodynamics and the impact of voluminous eruptions on the contemporary biosystem and climate system. Published stratigraphic data suggest that volcanic eruption took place from 69 to 64 million years (Ma) ago when the Indian plate passed over the Réunion hotspot. The main phase of volcanic activity consisting of about 80% of total basaltic lava, erupted rapidly, during a short span (<1 Ma) or even less (two or three hundred thousand years), close to chron 29R, straddling to the Cretaceous–Paleogene (K–Pg) boundary. Recent high-precision age data show that the main volcanic phase is genetically linked to the Chicxulub impact and plume-head of the hotspot, and largely contributed to the end-Cretaceous mass extinction. To assess the links of the province to the K–Pg boundary, Chicxulub impact, Réunion plume, and Late Cretaceous global climate crisis, it is crucial to have a current state of knowledge of the understanding of its stratigraphy. A review of published data shows a surge in the province research that has considerably advanced the understanding of its stratigraphy. This province is intercalated with numerous infra- and intertrappean sedimentary beds that have yielded diverse biota, providing a reliable relative time control for duration of the volcanic activity. This paper presents a review of the stratigraphic developments of the province (lithostratigraphy, chemostratigraphy, magnetostratigraphy, and chronostratigraphy) from the very beginning to the present, and discusses the role of the Réunion plume in its formation.</p></div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.crte.2019.10.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45747171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Page de Sommaire 目录页

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-10-01 DOI: 10.1016/S1631-0713(19)30127-0

引用次数: 0