Middle Paleozoic mafic magmatism and ocean plate stratigraphy of the South Tianshan, Kyrgyzstan

I. Safonova, G. Biske, R. L. Romer, R. Seltmann, V. Simonov, S. Maruyama

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The tectonic history of the Kyrgyz South Tianshan in the western Central Asian Orogenic Belt (CAOB) remains controversial, first of all, due to the limited amount of geochemical and isotope data. Our paper presents the first results of a detailed geochemical study (major and trace elements, Sr, Nd and Pb isotopes) of Middle Paleozoic mafic volcanic and subvolcanic rocks of the Ferghana and Atbashi-Kokshaal accretionary belts of the South Tianshan orogen in Kyrgyzstan, which formed during the evolution of the Turkestan Ocean. A special focus is given to the relation between magmatic rocks and sedimentary units of marine origin, chert, siliceous shale/mudstone, volcanogenic-carbonate clastics, seamount carbonates, and turbidites, which we consider as elements of Ocean Plate Stratigraphy (OPS). The age range of marine sediments is Late Silurian to Early Carboniferous, but the age of the most volcanic rocks associated with fossil-bearing OPS sediments is Devonian. The magmatic rocks have geochemical affinity to oceanic island basalts (OIB-type) and, to a lesser extent, mid-oceanic ridge (MORB-type) basalts associated with hemipelagic siliceous mudstone and pelagic chert. The rocks with OIB-type affinity are associated with chert, siliceous shale and carbonaceous clastics and carbonates. They are enriched in TiO2, LREE (La/Smn = 1.9), and Nb (Zr/Nbav. = 10), have differentiated HREE (Gd/Ybn = 2.0), medium to low εNd (~5.7) and are characterized by clear Nb positive anomalies in normalized multi-element plots (Nb/Thpm = 1.3, Nb/Lapm = 1.1). The OIBs formed by relatively low degrees of melting (

Original languageEnglish
Pages (from-to)236-256
Number of pages21
JournalGondwana Research
Volume30
DOIs
Publication statusPublished - Feb 1 2016
Externally publishedYes

Fingerprint

ocean island basalt
magmatism
stratigraphy
chert
Paleozoic
ocean
carbonate
rock
mudstone
shale
basalt
isotope
seamount
orogenic belt
mid-ocean ridge basalt
Silurian
marine sediment
volcanic rock
melting
trace element

Keywords

  • Central Asian Orogenic Belt
  • Ferghana-Atbashi-Kokshaal
  • Geochemistry
  • Petrogenesis
  • Sr-Nd-Pb isotopes
  • Turkestan Ocean

ASJC Scopus subject areas

  • Geology

Cite this

Safonova, I., Biske, G., Romer, R. L., Seltmann, R., Simonov, V., & Maruyama, S. (2016). Middle Paleozoic mafic magmatism and ocean plate stratigraphy of the South Tianshan, Kyrgyzstan. Gondwana Research, 30, 236-256. https://doi.org/10.1016/j.gr.2015.03.006

Middle Paleozoic mafic magmatism and ocean plate stratigraphy of the South Tianshan, Kyrgyzstan. / Safonova, I.; Biske, G.; Romer, R. L.; Seltmann, R.; Simonov, V.; Maruyama, S.

In: Gondwana Research, Vol. 30, 01.02.2016, p. 236-256.

Research output: Contribution to journalArticle

Safonova, I, Biske, G, Romer, RL, Seltmann, R, Simonov, V & Maruyama, S 2016, 'Middle Paleozoic mafic magmatism and ocean plate stratigraphy of the South Tianshan, Kyrgyzstan', Gondwana Research, vol. 30, pp. 236-256. https://doi.org/10.1016/j.gr.2015.03.006
Safonova, I. ; Biske, G. ; Romer, R. L. ; Seltmann, R. ; Simonov, V. ; Maruyama, S. / Middle Paleozoic mafic magmatism and ocean plate stratigraphy of the South Tianshan, Kyrgyzstan. In: Gondwana Research. 2016 ; Vol. 30. pp. 236-256.
@article{aa327f1111624a16b3475f666627d6da,
title = "Middle Paleozoic mafic magmatism and ocean plate stratigraphy of the South Tianshan, Kyrgyzstan",
abstract = "The tectonic history of the Kyrgyz South Tianshan in the western Central Asian Orogenic Belt (CAOB) remains controversial, first of all, due to the limited amount of geochemical and isotope data. Our paper presents the first results of a detailed geochemical study (major and trace elements, Sr, Nd and Pb isotopes) of Middle Paleozoic mafic volcanic and subvolcanic rocks of the Ferghana and Atbashi-Kokshaal accretionary belts of the South Tianshan orogen in Kyrgyzstan, which formed during the evolution of the Turkestan Ocean. A special focus is given to the relation between magmatic rocks and sedimentary units of marine origin, chert, siliceous shale/mudstone, volcanogenic-carbonate clastics, seamount carbonates, and turbidites, which we consider as elements of Ocean Plate Stratigraphy (OPS). The age range of marine sediments is Late Silurian to Early Carboniferous, but the age of the most volcanic rocks associated with fossil-bearing OPS sediments is Devonian. The magmatic rocks have geochemical affinity to oceanic island basalts (OIB-type) and, to a lesser extent, mid-oceanic ridge (MORB-type) basalts associated with hemipelagic siliceous mudstone and pelagic chert. The rocks with OIB-type affinity are associated with chert, siliceous shale and carbonaceous clastics and carbonates. They are enriched in TiO2, LREE (La/Smn = 1.9), and Nb (Zr/Nbav. = 10), have differentiated HREE (Gd/Ybn = 2.0), medium to low εNd (~5.7) and are characterized by clear Nb positive anomalies in normalized multi-element plots (Nb/Thpm = 1.3, Nb/Lapm = 1.1). The OIBs formed by relatively low degrees of melting (",
keywords = "Central Asian Orogenic Belt, Ferghana-Atbashi-Kokshaal, Geochemistry, Petrogenesis, Sr-Nd-Pb isotopes, Turkestan Ocean",
author = "I. Safonova and G. Biske and Romer, {R. L.} and R. Seltmann and V. Simonov and S. Maruyama",
year = "2016",
month = "2",
day = "1",
doi = "10.1016/j.gr.2015.03.006",
language = "English",
volume = "30",
pages = "236--256",
journal = "Gondwana Research",
issn = "1342-937X",
publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Middle Paleozoic mafic magmatism and ocean plate stratigraphy of the South Tianshan, Kyrgyzstan

AU - Safonova, I.

AU - Biske, G.

AU - Romer, R. L.

AU - Seltmann, R.

AU - Simonov, V.

AU - Maruyama, S.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - The tectonic history of the Kyrgyz South Tianshan in the western Central Asian Orogenic Belt (CAOB) remains controversial, first of all, due to the limited amount of geochemical and isotope data. Our paper presents the first results of a detailed geochemical study (major and trace elements, Sr, Nd and Pb isotopes) of Middle Paleozoic mafic volcanic and subvolcanic rocks of the Ferghana and Atbashi-Kokshaal accretionary belts of the South Tianshan orogen in Kyrgyzstan, which formed during the evolution of the Turkestan Ocean. A special focus is given to the relation between magmatic rocks and sedimentary units of marine origin, chert, siliceous shale/mudstone, volcanogenic-carbonate clastics, seamount carbonates, and turbidites, which we consider as elements of Ocean Plate Stratigraphy (OPS). The age range of marine sediments is Late Silurian to Early Carboniferous, but the age of the most volcanic rocks associated with fossil-bearing OPS sediments is Devonian. The magmatic rocks have geochemical affinity to oceanic island basalts (OIB-type) and, to a lesser extent, mid-oceanic ridge (MORB-type) basalts associated with hemipelagic siliceous mudstone and pelagic chert. The rocks with OIB-type affinity are associated with chert, siliceous shale and carbonaceous clastics and carbonates. They are enriched in TiO2, LREE (La/Smn = 1.9), and Nb (Zr/Nbav. = 10), have differentiated HREE (Gd/Ybn = 2.0), medium to low εNd (~5.7) and are characterized by clear Nb positive anomalies in normalized multi-element plots (Nb/Thpm = 1.3, Nb/Lapm = 1.1). The OIBs formed by relatively low degrees of melting (

AB - The tectonic history of the Kyrgyz South Tianshan in the western Central Asian Orogenic Belt (CAOB) remains controversial, first of all, due to the limited amount of geochemical and isotope data. Our paper presents the first results of a detailed geochemical study (major and trace elements, Sr, Nd and Pb isotopes) of Middle Paleozoic mafic volcanic and subvolcanic rocks of the Ferghana and Atbashi-Kokshaal accretionary belts of the South Tianshan orogen in Kyrgyzstan, which formed during the evolution of the Turkestan Ocean. A special focus is given to the relation between magmatic rocks and sedimentary units of marine origin, chert, siliceous shale/mudstone, volcanogenic-carbonate clastics, seamount carbonates, and turbidites, which we consider as elements of Ocean Plate Stratigraphy (OPS). The age range of marine sediments is Late Silurian to Early Carboniferous, but the age of the most volcanic rocks associated with fossil-bearing OPS sediments is Devonian. The magmatic rocks have geochemical affinity to oceanic island basalts (OIB-type) and, to a lesser extent, mid-oceanic ridge (MORB-type) basalts associated with hemipelagic siliceous mudstone and pelagic chert. The rocks with OIB-type affinity are associated with chert, siliceous shale and carbonaceous clastics and carbonates. They are enriched in TiO2, LREE (La/Smn = 1.9), and Nb (Zr/Nbav. = 10), have differentiated HREE (Gd/Ybn = 2.0), medium to low εNd (~5.7) and are characterized by clear Nb positive anomalies in normalized multi-element plots (Nb/Thpm = 1.3, Nb/Lapm = 1.1). The OIBs formed by relatively low degrees of melting (

KW - Central Asian Orogenic Belt

KW - Ferghana-Atbashi-Kokshaal

KW - Geochemistry

KW - Petrogenesis

KW - Sr-Nd-Pb isotopes

KW - Turkestan Ocean

UR - http://www.scopus.com/inward/record.url?scp=84957430538&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84957430538&partnerID=8YFLogxK

U2 - 10.1016/j.gr.2015.03.006

DO - 10.1016/j.gr.2015.03.006

M3 - Article

AN - SCOPUS:84957430538

VL - 30

SP - 236

EP - 256

JO - Gondwana Research

JF - Gondwana Research

SN - 1342-937X

ER -