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metabasalt

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Journal Article
Journal: Geology
Published: 20 December 2017
Geology (2017) 46 (2): 159-162.
... and Hf are frequently used to interpret the petrogenesis of mafic igneous rocks, but their behavior during dehydration and partial melting is still controversial. The contact aureole of the 1850 Ma Sudbury Igneous Complex (SIC, Canada) includes pyroxene hornfels facies metabasalts with systematically...
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Journal Article
Journal: GSA Bulletin
Published: 29 August 2017
GSA Bulletin (2017) 130 (1-2): 284-306.
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Journal Article
Published: 03 April 2017
Geological Magazine (2017) 155 (2): 316-334.
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Series: GSA Memoirs
Published: 01 September 2010
DOI: 10.1130/2010.1206(17)
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2423(10)
... planes within a subduction-accretion complex similar to those found in modern arcs. Following Kettner's pioneering work, most lithostratigraphic schemes proposed for this domain are based on the presence or absence of metabasalts, variably transformed into so-called “spilites.” According to recent...
Journal Article
Published: 01 November 2000
Journal of the Geological Society (2000) 157 (6): 1155-1167.
...-exposed in a pyrite quarry near Wieściszowice ( Fig. 2). Both provinces contain voluminous tholeiitic metabasites of MORB-like composition (including both metabasaltic lavas and high-level metadoleritic sills) consistent with magmatism in an extensional setting ( Winchester et al . 1995), subordinate...
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Journal Article
Journal: Geology
Published: 01 July 2000
Geology (2000) 28 (7): 580-582.
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Journal Article
Published: 01 March 2000
Geological Magazine (2000) 137 (2): 109-128.
... of abundant metabasaltic xenoliths signify a Tertiary age for the intrusion. The intrusion is characterized by alternating zones of gabbro and wehrlite; gabbro is both intruded and replaced by wehrlite, and the wehrlite zones are characterized by abundant metabasaltic xenoliths. Based on 87 Sr/ 86 Sr ratios...
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Journal Article
Published: 01 January 2000
Canadian Journal of Earth Sciences (2000) 36 (10): 1671-1695.
... indicative of a volcanic-arc origin. Limited results from Seventymile greenstones indicate a tholeiitic or calc-alkalic composition and intermediate to high Ti/V values (27–48), consistent with either a within-plate or an ocean-floor basalt origin. Y–La–Nb proportions in both TM and Seventymile metabasalts...
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Journal Article
Published: 21 October 1999
Canadian Journal of Earth Sciences (1999) 36 (6): 999-1019.
Journal Article
Journal: Geology
Published: 01 October 1999
Geology (1999) 27 (10): 947-950.
...) and was deformed in high-pressure granulite facies metamorphic conditions in the Paleoproterozoic (ca. 2.02 Ga). A younger event, possibly ca. 900 Ma, caused local amphibolite facies retrogression in the complex. Zircons from a metabasalt and a metatrondhjemite show external morphologies typical of high-grade...
Journal Article
Journal: Geology
Published: 01 August 1999
Geology (1999) 27 (8): 731-734.
Journal Article
Published: 01 August 1999
Mineralogical Magazine (1999) 63 (4): 489-501.
...S. W. Faryad; G. Hoinkes Abstract Low-grade metamorphic rocks from the Meliata unit (Western Carpathians) are characterized by the presence of typical blueschist-facies minerals. In metabasalt, an early low-pressure assemblage (<0.5 GPa at 350 degrees C), characterized by muscovite and zoisite...
Journal Article
Journal: Geology
Published: 01 June 1999
Geology (1999) 27 (6): 547-550.
Journal Article
Journal: Economic Geology
Published: 01 February 1999
Economic Geology (1999) 94 (1): 23-36.
...Caroline Perkins; Christoph A. Heinrich; Lesley A. I. Wyborn Abstract The 40 Ar/ 39 Ar dating of hydrothermal micas is used to determine the late metamorphic history of metacarbonate-hosted Cu ore deposition, regional metabasalt alteration, and relative uplift near the Proterozoic base metal...
Journal Article
Published: 01 October 1998
American Mineralogist (1998) 83 (9-10): 952-969.
Journal Article
Journal: Economic Geology
Published: 01 February 1998
Economic Geology (1998) 93 (1): 84-101.
... and comprises nine massive to pillowed lava flows and seven interflow sequences. The metabasalts from the Lake Cooper quarry have strong petrological and geochemical similarities to normal midocean ridge basalts (N-MORB) and to metabasalts from greenstone suites elsewhere in Victoria, suggesting that they have...
Journal Article
Journal: GSA Bulletin
Published: 01 June 1997
GSA Bulletin (1997) 109 (6): 683-697.
...S. Th. Schmidt; D. Robinson Abstract The 8-km-thick, Keweenawan metabasaltic, North Shore Volcanic Group in Minnesota shows a continuous zeolite to greenschist facies progression through five zonal divisions. Mafic phyllosilicates are ubiquitous and a well-developed smectite-corrensite-chlorite...
Journal Article
Published: 01 April 1997
Canadian Journal of Earth Sciences (1997) 34 (4): 536-548.
Journal Article
Published: 01 October 1996
Canadian Journal of Earth Sciences (1996) 33 (10): 1462-1473.