Strontium isotopes in the rocks of the ophiolite complex in the Khan-Tayshiri Range (Western Mongolia)
The distribution of strontium isotopes has been examined in a section through the ophiolite complex of the Khan-Tayshiri Range (Western Mongolia). The basal parts of the complex consist of apo-dunites (/sup 87/Sr//sup 86/Sr = 0.7118 - 0.7124), and higher up in the section there are pyroxenites (0.7064 - 0.7095) and gabbros (0.7034-0.7065). The upper parts of the complex consist of pillow lavas (0.7068-0.7071), the conduits for which were a series of laminar dikes (0.7057-0.7087). An analysis of petrological and geochemical information with a selection of isotope data suggests that during the formation of the rocks of the Khan-Tayshiri Complex, three components, different in nature and chemical composition, were involved: the remains of the Earth's protolithosphere in the form of apo-dunites, a mantle quartz-tholeiite magma, and seawater. Variations in the /sup 87/Sr//sup 86/Sr ratio are associated both with the isotope composition of the original magma, and also with the conditions of its emplacement. The ultrabasic rocks are regarded as relicts of the ancient ultrabasic layer or protolithosphere of the Earth.
- Research Organization:
- Inst. of Geochemistry, Moscow, USSR
- OSTI ID:
- 6682077
- Journal Information:
- Int. Geol. Rev.; (United States), Vol. 22:8; Other Information: Translated from Izv. Akad. Nauk SSR, Ser. Geol., No. 7, 36-45(1979)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IGNEOUS ROCKS
ISOTOPE RATIO
MONGOLIAN PEOPLES REPUBLIC
STRONTIUM 86
STRONTIUM 87
DISTRIBUTION
GEOCHEMISTRY
ORIGIN
PETROLOGY
ALKALINE EARTH ISOTOPES
ASIA
BETA DECAY RADIOISOTOPES
CHEMISTRY
EASTERN EUROPE
ELECTRON CAPTURE RADIOISOTOPES
EUROPE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOLOGY
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NUCLEI
RADIOISOTOPES
ROCKS
STABLE ISOTOPES
STRONTIUM ISOTOPES
USSR
580400* - Geochemistry- (-1989)