Comptes Rendus Geoscience最新文献_第6页

Secular cooling and crystallization of partially molten Archaean continental crust over 1 Ga 1ga以上部分熔融的太古代大陆地壳的长期冷却和结晶

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/j.crte.2019.07.002

Olivier Vanderhaeghe , Célia Guergouz , Cécile Fabre , Stéphanie Duchêne , David Baratoux

{"title":"Secular cooling and crystallization of partially molten Archaean continental crust over 1 Ga","authors":"Olivier Vanderhaeghe , Célia Guergouz , Cécile Fabre , Stéphanie Duchêne , David Baratoux","doi":"10.1016/j.crte.2019.07.002","DOIUrl":"10.1016/j.crte.2019.07.002","url":null,"abstract":"<div>The protracted tectonic and magmatic record of cratons over the Archaean Eon has been classically interpreted in terms of long-lived shallow-dipping subduction or repeated mantle plumes. In this paper, we use the 1D conductive heat equation to model the evolution of the geotherm of a generic felsic-dominated Archaean cratonic nuclei solely considering the secular decay of radioactive isotopes (238U, 235U, 232Th, and 40K), responsible for heat production in the crust. Using a range of plausible parameters for crustal thickness, lithospheric thickness, and surface heat flux, this modelling shows that Archaean crust was characterized by an initially high geothermal gradient at 3.5 Ga, with a Moho temperature close to 900 °C, and that it might have remained partially molten for about one billion years. The existence of a partially molten crust for an extended period of time offers an alternative option to shallow-dipping subduction or repeated mantle plumes for the understanding of the peculiar tectonic evolution of Archaean cratons marked by (i) protracted high-temperature metamorphism and magmatism associated with crustal differentiation, and (ii) widespread deformation characterized by structural domes attributed to the development of crustal-scale gravitational instabilities.</div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":"351 8","pages":"Pages 562-573"},"PeriodicalIF":1.4,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.crte.2019.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41707365","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: 15

The intermediate step in fractionation trends of mildly alkaline volcanic suites: An experimental insight from the Pavin trachyandesite (Massif Central, France) 弱碱性火山岩套分馏趋势的中间步骤：从Pavin粗安岩（法国中部Massif）获得的实验见解

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI: 10.1016/j.crte.2019.07.003

Morgane Rondet, Caroline Martel, Jean-Louis Bourdier

引用次数: 5

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>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 H2O-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 H2O-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 H2O-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 H2O solubilities are significantly lower and crystallization temperatures higher than in experiments.</div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":"351 8","pages":"Pages 540-550"},"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>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 Al2O3 increases with pressure (P) according to: P (in MPa) = 101.66 × Al2O3 in titanite (in wt%) + 59.013 (R2 = 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.</div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":"351 8","pages":"Pages 551-561"},"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

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

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>The Deccan Volcanic Province has been considered as one of the largest magmatic regions, involving an aerial coverage of ca. 500,000 km2. 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.</div>","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":"351 7","pages":"Pages 461-476"},"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