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Volume 27 Issue 6
Nov.  2016
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Zahra Tahmasbi, Masoud Kiani, Ahmad Ahmadi Khalaji. Petrology and Geochemistry of Diabasic Dikes and Andesitic-Basaltic Lavas in Noorabad-Harsin Ophiolite, SE of Kermanshah, Iran. Journal of Earth Science, 2016, 18(6): 935-944. doi: 10.1007/s12583-016-0686-4
Citation: Zahra Tahmasbi, Masoud Kiani, Ahmad Ahmadi Khalaji. Petrology and Geochemistry of Diabasic Dikes and Andesitic-Basaltic Lavas in Noorabad-Harsin Ophiolite, SE of Kermanshah, Iran. Journal of Earth Science, 2016, 18(6): 935-944. doi: 10.1007/s12583-016-0686-4

Petrology and Geochemistry of Diabasic Dikes and Andesitic-Basaltic Lavas in Noorabad-Harsin Ophiolite, SE of Kermanshah, Iran

doi: 10.1007/s12583-016-0686-4
  • Received Date: 2016-12-26
  • Rev Recd Date: 2016-12-26
  • Publish Date: 2016-12-26
  • The Noorabad-Harsin ophiolite is a part of the eastern Mediterranean-Zagros-OmanTethyan ophiolites. This area is located in the south-southwest of the main Zagros thrust zone. Thisophiolite consists of peridotites, serpentinites and pegmatite gabbros as mantle sequence whereascrustal sequence is composed of locally layered gabbros, isotropic gabbros, sheeted dike complex,basaltic to andesitic lavas and sedimentary rocks (radiolarites and Late Cretaceous pelagic limestones). The diabase dikes are enriched in LREE relative to HREE (La(n)/Yb(n)=1.7–3.3). Also, theandesites are enriched in LREE relative to HREE (La(n)/Yb(n)=3.1–5.37) and the pillow lavas areenriched in LILE (Th(n)/La(n)=2.1) while show a depletion in HFSE (Nb(n)/La(n)=0.07–0.2). Thebasaltic-andesitic lavas exhibiting mainly calc-alkaline, with minor island-arc tholeiitic affinities, arecharacterized by enrichment in LILE and LREE and depletion in HFSE. These geochemical characteristics compared with other Tethyan ophiolites along the Bitlis-Zagros suture zone reveal a suprasubduction zone environment for the genesis of the Noorabad-Harsin ophiolites.
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Petrology and Geochemistry of Diabasic Dikes and Andesitic-Basaltic Lavas in Noorabad-Harsin Ophiolite, SE of Kermanshah, Iran

doi: 10.1007/s12583-016-0686-4

Abstract: The Noorabad-Harsin ophiolite is a part of the eastern Mediterranean-Zagros-OmanTethyan ophiolites. This area is located in the south-southwest of the main Zagros thrust zone. Thisophiolite consists of peridotites, serpentinites and pegmatite gabbros as mantle sequence whereascrustal sequence is composed of locally layered gabbros, isotropic gabbros, sheeted dike complex,basaltic to andesitic lavas and sedimentary rocks (radiolarites and Late Cretaceous pelagic limestones). The diabase dikes are enriched in LREE relative to HREE (La(n)/Yb(n)=1.7–3.3). Also, theandesites are enriched in LREE relative to HREE (La(n)/Yb(n)=3.1–5.37) and the pillow lavas areenriched in LILE (Th(n)/La(n)=2.1) while show a depletion in HFSE (Nb(n)/La(n)=0.07–0.2). Thebasaltic-andesitic lavas exhibiting mainly calc-alkaline, with minor island-arc tholeiitic affinities, arecharacterized by enrichment in LILE and LREE and depletion in HFSE. These geochemical characteristics compared with other Tethyan ophiolites along the Bitlis-Zagros suture zone reveal a suprasubduction zone environment for the genesis of the Noorabad-Harsin ophiolites.

Zahra Tahmasbi, Masoud Kiani, Ahmad Ahmadi Khalaji. Petrology and Geochemistry of Diabasic Dikes and Andesitic-Basaltic Lavas in Noorabad-Harsin Ophiolite, SE of Kermanshah, Iran. Journal of Earth Science, 2016, 18(6): 935-944. doi: 10.1007/s12583-016-0686-4
Citation: Zahra Tahmasbi, Masoud Kiani, Ahmad Ahmadi Khalaji. Petrology and Geochemistry of Diabasic Dikes and Andesitic-Basaltic Lavas in Noorabad-Harsin Ophiolite, SE of Kermanshah, Iran. Journal of Earth Science, 2016, 18(6): 935-944. doi: 10.1007/s12583-016-0686-4

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