Author
Rollin E. Stevens
Bio: Rollin E. Stevens is an academic researcher from United States Geological Survey. The author has contributed to research in topics: Abrasion (geology) & Biotite. The author has an hindex of 7, co-authored 9 publications receiving 431 citations.
Papers
More filters
Journal Article•
170 citations
Journal Article•
127 citations
Journal Article•
67 citations
Journal Article•
27 citations
Journal Article•
22 citations
Cited by
More filters
TL;DR: The composition of chromian spinels in alpine-type peridotites has a large reciprocal range of Cr and Al, with increasing Cr# (Cr/(Cr+Al)) reflecting increasing degrees of partial melting in the mantle as mentioned in this paper.
Abstract: The composition of chromian spinel in alpine-type peridotites has a large reciprocal range of Cr and Al, with increasing Cr# (Cr/(Cr+Al)) reflecting increasing degrees of partial melting in the mantle. Using spinel compositions, alpine-type peridotites can be divided into three groups. Type I peridotites and associated volcanic rocks contain spinels with Cr# 0.60, and Type II peridotites and volcanics are a transitional group and contain spinels spanning the full range of spinel compositions in Type I and Type II peridotites. Spinels in abyssal peridotites lie entirely within the Type I spinel field, making ophiolites with Type I alpine-type peridotites the most likely candidates for sections of ocean lithosphere formed at a midocean ridge. The only modern analogs for Type III peridotites and associated volcanic rocks are found in arc-related volcanic and intrusive rocks, continental intrusive assemblages, and oceanic plateau basalts. We infer a sub-volcanic arc petrogenesis for most Type III alpine-type peridotites. Type II alpine-type peridotites apparently reflect composite origins, such as the formation of an island-arc on ocean crust, resulting in large variations in the degree and provenance of melting over relatively short distances. The essential difference between Type I and Type III peridotites appears to be the presence or absence of diopside in the residue at the end of melting.
1,884 citations
TL;DR: In this paper, the demand for lithium as LIB for the plug-in hybrid electric (PHEV), electric (EV) and hybrid electric vehicle in the recent future is huge and estimated to reach $221 billion by 2024.
858 citations
TL;DR: In this paper, it was shown that natural chromium-bearing spinel solid solutions adhere closely to the general formula (Mg, Fe++) (Cr, Al, Fe+++)2O4 and may therefore be graphically portrayed.
Abstract: Previous investigators have shown that natural chromium-bearing spinel solid solutions adhere closely to the general formula (Mg, Fe++) (Cr, Al, Fe+++)2O4 and may therefore be graphically portrayed...
525 citations
TL;DR: In this article, K-Rb covariance in 21 suites of igneous and quasi-igneous rocks has helped resolve the question of whether the ratio K:Rb remains constant or decreases steadily during igneous differentiation.
440 citations
Lockheed Martin Space Systems1, State University of New York System2, Max Planck Society3, Washington University in St. Louis4, Harvard University5, Cornell University6, Binghamton University7, California Institute of Technology8, Arizona State University9, Honeybee Robotics10, University of Nevada, Reno11, Space Science Institute12, University of Mainz13, Massachusetts Institute of Technology14, University of Tennessee15
TL;DR: In this article, outcrops created by the impact craters Endurance, Fram and Eagle reveal the broad lateral continuity of chemical sediments at the Meridiani Planum exploration site on Mars.
388 citations