Crust–mantle interaction in the genesis of siliceous high magnesian basalts: evidence from the Early Proterozoic Dongargarh Supergroup, India
TL;DR: In this paper, the authors present chemical (XRF, INAA) and mineralogical data on a siliceous high magnesian basalts (SHMB) suite from the Early Proterozoic (2.1-2.5 Ga) Dongargarh Supergroup, Central India, the first of its kind reported from the Indian Precambrian.
About: This article is published in Chemical Geology.The article was published on 2002-07-01. It has received 27 citations till now. The article focuses on the topics: Incompatible element & Volcanic rock.
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TL;DR: Based on geochemical and petrological studies of the Meso- to Neoproterozoic basic-acid rocks, a preliminary model for the formation and evolution history of the western Jiangnan orogen in the area was put forward as discussed by the authors.
184 citations
TL;DR: The Huangshandong mafic-ultramafic intrusion is the largest in the eastern Tianshan Orogenic Belt of the CAOB and consists of a layered unit intruded by a massive unit.
67 citations
Cites background from "Crust–mantle interaction in the gen..."
..., 1989), and modification of magmas through crust–mantle interaction (Sensarma et al., 2002)....
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...SHMB was first reported from western Australia (Redman and Keays, 1985) and rocks derived from SHMB-like magmas have subsequently been described elsewhere in the world, mostly from the Archean–Proterozoic with a few in the Phanerozoic (Arndt and Jenner, 1986; Maier and Barnes, 2010; Seitz and Keays, 1997; Sensarma et al., 2002; Srivastava, 2006, 2008; Srivastava et al., 2010; Sun et al., 1989, 1991; Wang and Zhou, 2006)....
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TL;DR: In this article, the evolution of the late Archean Belingwe greenstone belt, Zimbabwe, is discussed in relation to the geochemistry of the ultramafic to mafic volcanic rocks.
Abstract: The evolution of the late Archean Belingwe greenstone belt, Zimbabwe, is discussed in relation to the geochemistry of the ultramafic to mafic volcanic rocks. Four volcanic types (komatiite, komatiitic basalt, D-basalt and E-basalt) are distinguished in the 2� 7Ga Ngezi volcanic sequence using a combination of petrography and geochemistry. The komatiites and D-basalts are rocks in which isotopic systems and trace elements are depleted. Chemical variations in komatiites and D-basalts can be explained by fractional crystallization from the parental komatiite. In contrast, komatiitic basalts and E-basalts are siliceous and display enriched isotopic and trace element compositions. Their chemical trends are best explained by assimilation with fractional crystallization (AFC) from the primary komatiite. AFC calculations indicate that the komatiitic basalts and E-basalts are derived from komatiites contaminated with � 20% and � 30% crustal material, respectively. The volcanic stratigraphy of the Ngezi sequence, which is based on field relationships and the trace element compositions of relict clinopyroxenes, shows that the least contaminated komatiite lies between highly contaminated komatiitic basalt flows, and has limited exposure near the base of the succession. Above these flows, D- and E-basalts alternate. The komatiite appears to have erupted on the surface only in the early stages, when plume activity was high. As activity decreased with time, komatiite magmas may have stagnated to form magma chambers within the continental crust. Subsequent komatiitic magmas underwent fractional crystallization and were contaminated with crust to form D-basalts or E-basalts.
65 citations
Cites background from "Crust–mantle interaction in the gen..."
...Komatiitic basalt and E-basalt Komatiitic basalts are enriched in both LREE and radiogenic isotopic compositions, and their chemical characteristics, including high SiO2 and MgO contents, are similar to those of siliceous high magnesian basalts (SHMB), which have been suggested to be derived by crustal contamination of komatiite magmas (e.g. Redman & Keays, 1985; Arndt & Jenner, 1986; Barley, 1986; Sensarma et al., 2002)....
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TL;DR: In this paper, a new tectonic classification of the Bastar craton into the Western Bastar Craton (WBC), EBC, and the intervening Central Bastar Orogen (CBO) is proposed.
57 citations
TL;DR: The Bastar craton has experienced many episodes of mafic magmatism during the Precambrian as discussed by the authors, and this is evidenced from a variety of precambrian volcanic and dyke formations exposed in all parts of the Bastar basin in the form of volcanics and dykes.
Abstract: The Bastar craton has experienced many episodes of mafic magmatism during the Precambrian. This is evidenced from a variety of Precambrian mafic rocks exposed in all parts of the Bastar craton in the form of volcanics and dykes. They include (i) three distinct mafic dyke swarms and a variety of mafic volcanic rocks of Precambrian age in the southern Bastar region; two sets of mafic dyke swarms are sub-alkaline tholeiitic in nature, whereas the third dyke swarm is high-Si, low-Ti and high-Mg in nature and documented as boninite-norite mafic rocks, (ii) mafic dykes of varying composition exposed in Bhanupratappur-Keskal area having dominantly high-Mg and high-Fe quartz tholeiitic compositions and rarely olivine and nepheline normative nature, (iii) four suites of Paleoproterozoic mafic dykes are recognized in and around the Chattisgarh basin comprising metadolerite, metagabbro, and metapyroxenite, Neoarchaean amphibolite dykes, Neoproterozoic younger fine-grained dolerite dykes, and Early Precambrian boninite dykes, and (iv) Dongargarh mafic volcanics, which are classified into three groups, viz. early Pitepani mafic volcanic rocks, later Sitagota and Mangikhuta mafic volcanics, and Pitepani siliceous high-magnesium basalts (SHMB). Available petrological and geochemical data on these distinct mafic rocks of the Bastar craton are summarized in this paper. Recently high precision U-Pb dates of 1891.1±0.9 Ma and 1883.0±1.4 Ma for two SE-trending mafic dykes from the BD2 (subalkaline) dyke swarm, from the southern Bastar craton have been reported. But more precise radiometric age determinations for a number of litho-units are required to establish discrete mafic magmatic episodes experienced by the craton. It is also important to note that very close geochemical similarity exist between boninite-norite suite exposed in the Bastar craton and many parts of the world. Spatial and temporal correlation suggests that such magmatism occurred globally during the Neoarchaean-Paleoproterozoic boundary. Many Archaean terrains were united as a supercontinent as Expanded Ur and Arctica at that time, and its rifting gave rise to numerous mafic dyke swarms, including boninitenorite, world-wide.
55 citations
References
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TL;DR: In this paper, the authors show that 2.3 wt % dissolved H2O produces a liquidus depression in primary olivine liquidus depressed (∞ C) = 74·403 · (H2 Ow t %) 0 · 352.
Abstract: GPa and in the presence of 2‐3 wt % H2O. The eVect of 2‐3 wt % dissolved H2O produces a liquidus depression in primary olivine liquidus depression (∞ C) = 74·403 · (H2 Ow t %) 0 · 352 . boninite of >112 ‐ 19∞C at a given temperature. The H2O- The equation that describes this empirical relationship is non-linear bearing melts, recalculated to 100 wt % anhydrous, are >2‐6 with an error of >9 relative percent. wt % higher in MgO, >1‐2 wt % higher in SiO2 and >1‐1·5 wt % lower in FeO, compared with nominally anhydrous melts at the same P and T. These diVerences are consistent with a change in the melting reaction, resulting in a higher contribution of or- KEY WORDS: high-Ca boninites; mantle melting; H2O-undersaturated melting; olivine liquidus depression; anhydrous melting thopyroxene to the melt phase, compared with anhydrous conditions.
356 citations
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01 Jan 1994TL;DR: Archean komatiites, N.C. Des Marais et al. as discussed by the authors proposed a preliminary assessment of the Siberian craton and early proterozoic evolution of the craton.
Abstract: Archean komatiites, N.T. Arndt archean volcanic patterns, P.C. Thurston greenstones through time, K.C. Condie archean greenstone-related sedimentary rocks, D.R. Lowe archean synrift and stable-shelf sedimentary successions, K.A. Eriksson and C.M. Fedo archean grey gneisses and the genesis of continental crust, H. Martin archean granite plutons, P.J. Sylvester archean anorthosites, L.D. Aswal and J.S. Myers archean high-grade metamorphism, J.A. Percival archean and early proterozoic evolution of the Siberian craton - a preliminary assessment, O.M. Rosen et al archean mineralisation, D.I. Groves and M.E. Barley the archean atmosphere - its composition and fate, D.J. Des Marais.
353 citations
01 Jan 1990
TL;DR: In this paper, the authors present a model for the granulite-migmatite association in the Archean basement of southwestern Montana and a multi-stage late-architectural granulites facies metamorphism in Northern Labrador, Canada.
Abstract: The NATO ARW granulite conference: a report.- Crustal Evolution.- Genesis of continental crust: evidence from island arcs, granulites, and exospheric processes.- The granulite - granite connexion.- Heat, fluids, and melting in the granulite facies.- Granites, granulites, and crustal differentiation.- Regional Syntheses.- Europe.- Evolution of the lower crust in the Ivrea zone: a model based on isotopic and geochemical data.- The granulite belt of Lapland.- North and South America.- A model for the granulite-migmatite association in the Archean basement of southwestern Montana.- Multi stage late Archaean granulite facies metamorphism in Northern Labrador, Canada.- Archean tectonic setting of granulite terranes of the Superior Province, Canada, a view from the bottom.- The granulites of the Jequie complex and Atlantic Coast mobile belt, Southern Bahia, Brazil - An expression of Archean/Early Proterozoic plate convergence.- From Africa to India.- Pressure-Temperature-Time paths of granulite metamorphism and uplift, Zambesi belt, N.E. Zimbabwe.- Thermal history and tectonic setting of the Namaqualand granulites, Southern Africa: clues to Proterozoic crustal development.- The granulite-facies rocks of the Limpopo belt, Southern Africa.- Crustal evolution of the granulites of Madagascar.- Nature and scale of fluid-rock exchange in granulite grade rocks of Sri Lanka: a stable isotope study.- The granulite terrane of the Nilgiri Hills (Southern India): characterization of high-grade metamorphism.- Fluids and Petrological Equilibria.- Granulites of Satnuru and Madras: A study in different behaviour of fluids.- Scapolite phase equilibria: additional constraints on the role of CO2 in granulite genesis.- Synmetamorphic fluid inclusions in granulites.- Fluid inclusions in granulites: peak vs. retrograde formation.- Thermometry and barometry of mafic granulites based on garnet - clinopyroxene - plagioclase - quartz assemblages.- Geochemistry and Geophysics.- Geochronology in Granulites.- Origin of granulites: geochemical constraints from Archean granulite facies rocks of the Sino-Korean craton, China.- The oxygen isotope composition of lower crustal granulite xenoliths.- Ionprobe investigation of rare earth element distributions and partial melting of metasedimentary granulites.- Geochemistry of intermediate/- to high-pressure granulites.- Thermal data and crustal structure. Role of granites and the depleted lower crust.- Some thermal aspects of granulite history.- Key word/subject index.
341 citations
TL;DR: In this paper, mass spectrometric analyses of Nb, Th, REE and other trace elements in Archaean to Tertiary komatiites and basalts were undertaken to test the model of Hofmann et al.
272 citations