http://www.cnr.it/ontology/cnr/individuo/prodotto/ID208582

Miocene andalusite leucogranite in central-east Himalaya (Everest-Masang Kang area): Low-pressure melting during heating. (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Miocene andalusite leucogranite in central-east Himalaya (Everest-Masang Kang area): Low-pressure melting during heating. (Articolo in rivista) (literal)

Anno

2012-01-01T00:00:00+01:00 (literal)

Alternative label

Visona D. [1]; Carosi R. [2]; Montomoli C. [3];Tiepolo M. [4]; Peruzzo L. [5] (2012)
Miocene andalusite leucogranite in central-east Himalaya (Everest-Masang Kang area): Low-pressure melting during heating.
in Lithos (Oslo. Print); Elsevier, Oxford (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Visona D. [1]; Carosi R. [2]; Montomoli C. [3];Tiepolo M. [4]; Peruzzo L. [5] (literal)

Pagina inizio

194 (literal)

Pagina fine

208 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.journals.elsevier.com/lithos (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

144-145 (literal)

Rivista

Lithos (Rivista)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

[1] Dipartimento di Geoscienze, University of Padova, Padova, Italy [2] Dipartimento di Scienze della Terra, University of Torino, Torino, Italy [3] Dipartimento di Scienze della Terra, University of Pisa, Pisa, Italy [4] C.N.R.-Istituto di Geoscienze e Georisorse, UOS Pavia, Pavia, Italy [5] C.N.R.-Istituto di Geoscienze e Georisorse, Sez.di Padova c/o Dip. di Geoscienze, University of Padova, Padova, Italy (literal)

Titolo

Miocene andalusite leucogranite in central-east Himalaya (Everest-Masang Kang area): Low-pressure melting during heating. (literal)

Abstract

The studied Miocene andalusite-bearing leucogranites intrude the upper part of the High Himalayan Crystallines (HHC) and the north Himalayan domes and outcrop in an area stretching from Mt. Everest to the Kula Khangri massif (Bhutan) towards the east. The leucogranites constitute both dykes as well as sills and parts of larger andalusite-free leucogranite plutons (e.g., Makalu). They represent mainly of two-mica (muscovite + biotite ± tourmaline ± cordierite ± andalusite ± sillimanite ± dumortierite) leucogranite, and tourmaline (muscovite + tourmaline ± biotite ± andalusite ± sillimanite ± garnet ± kyanite ± spinel ± corundum) leucogranites. Microstructures reveal several generations of andalusite (from residual/peritectic early magmatic to cotectic late magmatic), even in the same sample. The occurrence of residual and/or peritectic andalusite, together with inclusions of sillimanite + biotite in cordierite, indicates that melts formed by dehydration melting of biotite at T = 660-700 °C during prograde heating at low-pressure conditions (P < about 400 MPa). According to current models, leucogranites are produced by dehydration melting of muscovite and/or biotite during exhumation of the HHC. In this case, micas are consumed in the sillimanite stability field. As a consequence, these models cannot explain the occurrence of residual and/or peritectic magmatic andalusite. Conditions for anatexis in the andalusite field may have been achieved by heat transfer within the exhuming (extruding) HHC, from structurally lower and hotter rocks towards upper and colder fertile lithologies. (literal)

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