Other
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..58..301z&link_type=abstract
Earth and Planetary Science Letters, Volume 58, Issue 3, p. 301-329.
Other
34
Scientific paper
The Cenozoic volcanic rocks of eastern China are subalkalic to alkalic basalts erupted in an early Tertiary back-arc rift environment and from scattered late Tertiary and Quaternary volcanic centers in a continental area crossed by active faults, driven by subduction of the Pacific plate and the collision of India and Eurasia. Immobile trace elements and major elements conform very well to each other in classification of the 59 rocks for which complete data are reported and they correctly identify the tectonic setting. LIL-element enrichments of the basalts lie between those of P-MORB and ocean island alkalic basalts, and show a secular increase.
87Sr/86Sr ratios of basalts vary from 0.7029 to 0.7048. Alkalic basalts are systematically less radiogenic than geographically coextensive and contemporaneous tholeiitic basalts. Increase of radiogenic Sr with increasing crustal thickness and crustal age and with silica enrichment of the magmas suggests crustal contamination but this is inadequate to explain the LIL-element enrichment patterns and variable LIL-element enrichments. The preferred hypothesis is that the alkalic magmas come from a deeper source, with long-term LIL-element depletion and low Rb/Sr ratio but relatively recent LIL-element enrichment. Conversely the tholeiitic magmas are melts of subcontinental mantle lithosphere that is more LIL-element depleted than the alkalic source, at the time of magma genesis, but has had an elevated Rb/Sr ratio for much of its post-consolidation history.
Armstrong Richard Lee
Zhou Xinghua
No associations
LandOfFree
Cenozoic volcanic rocks of eastern China - secular and geographic trends in chemistry and strontium isotopic composition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cenozoic volcanic rocks of eastern China - secular and geographic trends in chemistry and strontium isotopic composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cenozoic volcanic rocks of eastern China - secular and geographic trends in chemistry and strontium isotopic composition will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1100746