Petrological, Geochemical and Isotopic Constraints on the Origin of the Harzburg Intrusion, Germany

Sano, Sakae; Oberhänsli, Roland; Romer, Rolf L.; Vinx, Roland

doi:10.1093/petrology/43.8.1529

Cited by 15 publications

(9 citation statements)

References 25 publications

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“…These features are consistent with derivation from mantle melts (Sato 1977;Sano et al 2002;de Hoog et al 2010). Low Cr contents in olivine (6 ppm) compared to other mantle-derived lherzolite examples (de Hoog et al 2010) is interpreted to reflect sequestering of Cr in phlogopite over olivine.…”

Section: Geoscience Canadasupporting

confidence: 78%

Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

LaFlamme

McFarlane

Corrigan

2015

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SUMMARYThe Repulse Bay block (RBb) of the southern Melville Peninsula, Nunavut, lies within the Rae craton and exposes a large (50,000 km 2 ) area of middle to lower crust. The block is composed of ca. 2.86 Ga and 2.73-2.71 Ga tonalite-trondhjemitegranodiorite (TTG) and granitic gneiss that was derived from an older 3.25 and 3.10 Ga crustal substrate. This period of crustal generation was followed by the emplacement of ca. 2.69-2.66 Ga enderbite, charnockite, and granitoid intrusions with entrained websterite xenoliths. These voluminous batholith-scale bodies (dehydrated and hydrated intrusions), and the associated websterite xenoliths, have similar whole rock geochemical properties, including fractionated light rare earth element (LREE)-heavy (H)REE whole rock patterns and negative Nb, Ti, and Ta anomalies. Dehydrated intrusions and websterite xenoliths also contain similar mineralogy (two pyroxene, biotite, interstitial amphibole) and similar pyroxene trace element compositions. Based on geochemical and mineralogical properties, the two lithologies are interpreted to be related by fractional crystallization, and to be the product of a magmatic cumulate processes. Reworking of the crust in a ca. 2.72 Ga subduction zone setting was followed by ca. 2.69 Ga upwelling of the asthenospheric mantle and the intrusion of massif-type granitoid plutons. Based on a dramatic increase in FeO, Zr, Hf, and LREE content of the most evolved granitoid components from the 2.69-2.66 Ga cumulate intrusion, we propose that those granitoid plutons were in part derived from a metasomatized mantle source enriched by fluids from the subducting oceanic slab that underwent further hybridization (via assimilation) with the crust. Large-scale, mantle-derived Neoarchean sanukitoid-type magmatism played a role in the development of a depleted lower crust and residual sub-continental lithospheric mantle, a crucial element in the preservation of the RBb. RÉSUMÉ

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Section: Geoscience Canadasupporting

confidence: 78%

Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

LaFlamme

McFarlane

Corrigan

2015

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“…The rocks show variable initial 87 Sr/ 86 Sr ratios (0.706-0.711), with relatively constant e Nd (t) values (+2.7 to +6.1) which suggest a common source region. Moreover, the Sr isotopic compositions of the Cihai diabases exhibit positive correlation with LOI (loss of ignition) (not shown), suggesting that the Sr concentrations have been considerably affected by alteration, possibly through fluids (Sano et al, 2002), which is also consistent with the presence of secondary biotite in the diabases. Accordingly, the Sr-Nd isotopic ratios of our samples are plotted above the mantle array (Fig.…”

Section: Sr and Nd Isotopesmentioning

confidence: 78%

The Cihai diabase in the Beishan region, NW China: Isotope geochronology, geochemistry and implications for Cornwall-style iron mineralization

Hou¹,

Zhang²,

Santosh³

et al. 2013

Journal of Asian Earth Sciences

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“…Magmatic hornblende has been reported from other mafic and ultrama& cumulate rocks (e.g. Cawthorn, 1975;Wilson and Sorensen, 1996;Garuti et al, 2001;Cesare et d., 2002;Meurer and Claeson, 2002;Sano et al, 2002; Claeson and Meurer, 2004). However, its widespread wcurrence in GIC, especially its common presence in Fridotites, is a peculiar feature and suggests the involvement of a hydrous melt.…”

Section: Hornblende Significancementioning

confidence: 96%

The Gaojiacun Mafic-Ultramafic Complex (Sichuan, SW China): Neoproterozoic Magmatic Activity at the Western Margin of the Yangtze Craton

Munteanu

Yao

Wilson

et al. 2010

Acta Geologica Sinica - English Edition

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The Neoproterozoic Gaojiacun intrusive complex (GIC) is composed of one big intrusion (ca. 9 times 7.5 km) and numerous satellite intrusions, emplaced in the low‐grade schists of the Neoproterozoic Yanbian Group. The main intrusion is concentrically zoned, with peridotite bodies + leucogabbroids in its core (inner zone) and the sequence: olivine hornblende gabbronorite − porphyric pyroxene hornblende gabbronorite (transitional zone) ‐ pyroxene hornblende gabbronorite + hornblende gabbro + diorite (outer zone), towards the margins. The satellite intrusions are composed either of a single rock type (peridotite, gabbro, diorite or granite) or of different rock types (peridotite + diorite + granite). Upper crustal contamination is evidenced by the occurrence of numerous metamorphic enclaves, migmatites and mixed rocks in the outer zone of the main intrusion and in the satellite intrusions. Hornblende (often oikocrystic) is present in all mafic and ultramafic rocks. Cu‐Ni (‐PGE) deposits occur in several satellite intrusions, hosted in peridotite. The geochemical and mineralogical features of GIC support the presence of a subduction zone at the western edge of the Yangtze Craton. A feeder‐related genesis of the satellite intrusions is inferred.

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Petrological, Geochemical and Isotopic Constraints on the Origin of the Harzburg Intrusion, Germany

Cited by 15 publications

References 25 publications

Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

Neoarchean Mantle-derived Magmatism within the Repulse Bay Block, Melville Peninsula, Nunavut: Implications for Archean Crustal Extraction and Cratonization

The Cihai diabase in the Beishan region, NW China: Isotope geochronology, geochemistry and implications for Cornwall-style iron mineralization

The Gaojiacun Mafic-Ultramafic Complex (Sichuan, SW China): Neoproterozoic Magmatic Activity at the Western Margin of the Yangtze Craton

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