Journal ArticleDOI
Minor-Element Distribution in Olivine
Tom Simkin,J. V. Smith +1 more
TLDR
In this paper, micro-probe analyses of natural igneous olivines from many rocks confirm that Ni increases and Mn de-decreases with increasing Mg content.Abstract:
Microprobe analyses of natural igneous olivines from many rocks confirm that Ni increases and Mn de-decreases with increasing Mg content. A strong crystal-chemical control is apparently not overridden by effects resulting from pressure-temperature variations during crystallization or from variations in bulk composition of the host magma. Calcium ranges from 0 to 1 wt percent and, although commonly increasing with Fe in zoned grains, does not correlate generally with major elements. However, most plutonic olivines have less than 0.10 percent and are separated almost completely from olivines from extrusive and hypabyssal rocks with over 0.10 percent Ca. Depth of crystallization appears to play a major role in determining Ca content, but the data provide no evidence for the correlation of Ca content with crystallization temperature anticipated from experimental work. Diffusion of minor elements in and out of olivine during slow cooling is demonstrated, but its effect on Ca content is uncertain. Some correlat...read more
Citations
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MonographDOI
Deep-seated inclusions in kimberlites and the problem of the composition of the upper mantle
Journal ArticleDOI
Calcium exchange between olivine and clinopyroxene calibrated as a geothermobarometer for natural peridotites from 2 to 60 kb with applications
T.P Köhler,Gerhard P. Brey +1 more
TL;DR: In this article, the equilibrium Ca content of olivine coexisting with clinopyroxene was experimentally determined in natural lherzolitic compositions (Mg/(Mg + Fe)ol ≈ 0.9).
Journal ArticleDOI
The geochemistry of basalts from a back-arc spreading centre in the East Scotia Sea
Andrew D. Saunders,J. Tarney +1 more
TL;DR: In this paper, the authors show that the back-arc basalts can be derived from an essentially similar mantle source (with respect to these elements) through varying degrees of partial melting, but involving some residual clinopyroxene.
Journal ArticleDOI
Petrology and Geochemistry of Boninites from the North Termination of the Tonga Trench: Constraints on the Generation Conditions of Primary High-Ca Boninite Magmas
TL;DR: A detailed mineralogical, geochemical, and experimental study of a high-Ca boninite suite from the northern termination of the Tonga trench was performed in this paper. Butterworth et al. reported that the primary melts were characterized by high MgO contents (22-24 wt.%) and were also characterized by a wide range of incompatible-element contents, e.g., (La/Yb)y varies from 05 to 16, whereas compatible major-element concentrations (A12O3, FeO, CaO, SiO2, and
Journal ArticleDOI
Nickel content of basaltic magmas: identification of primary magmas and a measure of the degree of olivine fractionation
TL;DR: In this paper, the fractionation behavior of nickel in basaltic magma due to the crystallization of olivine has been calculated using constant NiMg and FeMg exchange partition coefficients.
References
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Journal ArticleDOI
Origin of Basalt Magmas: An Experimental Study of Natural and Synthetic Rock Systems
H. S. Yoder,C. E. Tilley +1 more
Journal ArticleDOI
Ultramafic inclusions in basaltic rocks from Hawaii
TL;DR: In this article, the inclusions were separated into three categories, which correlate with three groups basaltic hosts: lherzolite inclusions are relatively poor in Fe, and the component minerals have limited ranges of composition.
Journal ArticleDOI
The role of olivine in the crystallization of the prehistoric Makaopuhi tholeiitic lava lake, Hawaii
James G. Moore,Bernard W. Evans +1 more
TL;DR: In the case of the Makaopuhi lake, the olivine phenocrysts settled at an average rate of about 4 × 10−6 cm Sec−1 to form a zone that contains 21 percent olivines 75 feet above the base.
Basement Rocks and Structural Evolution of Southern Oklahoma
TL;DR: Basement rocks in the 17,000 square-mile region of southern Oklahoma crop out in the Wichita and Arbuckle Mountains and have been studied in subsurface samples f rom 175 wells as mentioned in this paper.
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