Igneous rock associations 21. The early permian panjal traps of the western himalaya

Research output: Contribution to journalArticle

Abstract

The Early Permian (290 Ma) Panjal Traps are the largest contiguous outcropping of volcanic rocks associated with the Himalayan Magmatic Province (HMP). The eruptions of HMP-related lava were contemporaneous with the initial break-up of Pangea. The Panjal Traps are primarily basalt but volumetrically minor intermediate and felsic volcanic rocks also occur. The basaltic rocks range in composition from continental tholeiite to ocean-floor basalt and nearly all have experienced, to varying extent, crustal contamination. Uncontaminated basaltic rocks have Sr—Nd isotopes similar to a chondrit- ic source (ISr = 0.7043 to 0.7073; ƹNd(t) = 0 ± 1), whereas the remaining basaltic rocks have a wide range of Nd (ƹNd(t) = — 6.1 to +4.3) and Sr (ISr = 0.7051 to 0.7185) isotopic values. The calculated primary melt compositions of basalt are picritic and their mantle potential temperatures (Tp ≤ 1450°C) are similar to ambient mantle rather than anomalously hot mantle. The silicic volcanic rocks were likely derived by partial melting of the crust whereas the andesitic rocks were derived by mixing between crustal and mantle melts. The Traps erupted within a continental rift setting that developed into a shallow sea. Sustained rifting created a nascent ocean basin that led to sea- floor spreading and the rifting of microcontinents from Gondwana to form the ribbon-like continent Cimmeria and the Neotethys Ocean.

Original languageEnglish
Pages (from-to)251-264
Number of pages14
JournalGeoscience Canada
Volume43
Issue number4
DOIs
Publication statusPublished - 2016 Jan 1

Fingerprint

igneous rock
Permian
mantle
volcanic rock
basalt
rock
rifting
seafloor
melt
Pangaea
tholeiite
felsic rock
crustal contamination
potential temperature
ocean basin
lava
Gondwana
partial melting
volcanic eruption
isotope

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Igneous rock associations 21. The early permian panjal traps of the western himalaya. / Shellnutt, J. Gregory.

In: Geoscience Canada, Vol. 43, No. 4, 01.01.2016, p. 251-264.

Research output: Contribution to journalArticle

@article{93bc9f7d7b234183a0d27141d8390e38,
title = "Igneous rock associations 21. The early permian panjal traps of the western himalaya",
abstract = "The Early Permian (290 Ma) Panjal Traps are the largest contiguous outcropping of volcanic rocks associated with the Himalayan Magmatic Province (HMP). The eruptions of HMP-related lava were contemporaneous with the initial break-up of Pangea. The Panjal Traps are primarily basalt but volumetrically minor intermediate and felsic volcanic rocks also occur. The basaltic rocks range in composition from continental tholeiite to ocean-floor basalt and nearly all have experienced, to varying extent, crustal contamination. Uncontaminated basaltic rocks have Sr—Nd isotopes similar to a chondrit- ic source (ISr = 0.7043 to 0.7073; ƹNd(t) = 0 ± 1), whereas the remaining basaltic rocks have a wide range of Nd (ƹNd(t) = — 6.1 to +4.3) and Sr (ISr = 0.7051 to 0.7185) isotopic values. The calculated primary melt compositions of basalt are picritic and their mantle potential temperatures (Tp ≤ 1450°C) are similar to ambient mantle rather than anomalously hot mantle. The silicic volcanic rocks were likely derived by partial melting of the crust whereas the andesitic rocks were derived by mixing between crustal and mantle melts. The Traps erupted within a continental rift setting that developed into a shallow sea. Sustained rifting created a nascent ocean basin that led to sea- floor spreading and the rifting of microcontinents from Gondwana to form the ribbon-like continent Cimmeria and the Neotethys Ocean.",
author = "Shellnutt, {J. Gregory}",
year = "2016",
month = "1",
day = "1",
doi = "10.12789/geocanj.2016.43.104",
language = "English",
volume = "43",
pages = "251--264",
journal = "Geoscience Canada",
issn = "0315-0941",
publisher = "Geological Association of Canada",
number = "4",

}

TY - JOUR

T1 - Igneous rock associations 21. The early permian panjal traps of the western himalaya

AU - Shellnutt, J. Gregory

PY - 2016/1/1

Y1 - 2016/1/1

N2 - The Early Permian (290 Ma) Panjal Traps are the largest contiguous outcropping of volcanic rocks associated with the Himalayan Magmatic Province (HMP). The eruptions of HMP-related lava were contemporaneous with the initial break-up of Pangea. The Panjal Traps are primarily basalt but volumetrically minor intermediate and felsic volcanic rocks also occur. The basaltic rocks range in composition from continental tholeiite to ocean-floor basalt and nearly all have experienced, to varying extent, crustal contamination. Uncontaminated basaltic rocks have Sr—Nd isotopes similar to a chondrit- ic source (ISr = 0.7043 to 0.7073; ƹNd(t) = 0 ± 1), whereas the remaining basaltic rocks have a wide range of Nd (ƹNd(t) = — 6.1 to +4.3) and Sr (ISr = 0.7051 to 0.7185) isotopic values. The calculated primary melt compositions of basalt are picritic and their mantle potential temperatures (Tp ≤ 1450°C) are similar to ambient mantle rather than anomalously hot mantle. The silicic volcanic rocks were likely derived by partial melting of the crust whereas the andesitic rocks were derived by mixing between crustal and mantle melts. The Traps erupted within a continental rift setting that developed into a shallow sea. Sustained rifting created a nascent ocean basin that led to sea- floor spreading and the rifting of microcontinents from Gondwana to form the ribbon-like continent Cimmeria and the Neotethys Ocean.

AB - The Early Permian (290 Ma) Panjal Traps are the largest contiguous outcropping of volcanic rocks associated with the Himalayan Magmatic Province (HMP). The eruptions of HMP-related lava were contemporaneous with the initial break-up of Pangea. The Panjal Traps are primarily basalt but volumetrically minor intermediate and felsic volcanic rocks also occur. The basaltic rocks range in composition from continental tholeiite to ocean-floor basalt and nearly all have experienced, to varying extent, crustal contamination. Uncontaminated basaltic rocks have Sr—Nd isotopes similar to a chondrit- ic source (ISr = 0.7043 to 0.7073; ƹNd(t) = 0 ± 1), whereas the remaining basaltic rocks have a wide range of Nd (ƹNd(t) = — 6.1 to +4.3) and Sr (ISr = 0.7051 to 0.7185) isotopic values. The calculated primary melt compositions of basalt are picritic and their mantle potential temperatures (Tp ≤ 1450°C) are similar to ambient mantle rather than anomalously hot mantle. The silicic volcanic rocks were likely derived by partial melting of the crust whereas the andesitic rocks were derived by mixing between crustal and mantle melts. The Traps erupted within a continental rift setting that developed into a shallow sea. Sustained rifting created a nascent ocean basin that led to sea- floor spreading and the rifting of microcontinents from Gondwana to form the ribbon-like continent Cimmeria and the Neotethys Ocean.

UR - http://www.scopus.com/inward/record.url?scp=85006952463&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85006952463&partnerID=8YFLogxK

U2 - 10.12789/geocanj.2016.43.104

DO - 10.12789/geocanj.2016.43.104

M3 - Article

VL - 43

SP - 251

EP - 264

JO - Geoscience Canada

JF - Geoscience Canada

SN - 0315-0941

IS - 4

ER -