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Trace Element Abundances And Sr Nd Pb Isotopic Constraints On The Petrogenesis Of Juan Fernandez Lavas
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Book Synopsis Trace Element Abundances and Sr-Nd-Pb Isotopic Constraints on the Petrogenesis of Juan Fernandez Lavas by : Thi Bich Truong
Download or read book Trace Element Abundances and Sr-Nd-Pb Isotopic Constraints on the Petrogenesis of Juan Fernandez Lavas written by Thi Bich Truong and published by . This book was released on 2015 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of the Juan Fernandez Islands in the South Pacific is of geologic importance due to high-3He/4He ratios that span a considerable range (7.8-18.0 Ra). To constrain the petrogenesis and mantle source of the islands, bulk trace element abundances and Pb isotopic compositions were obtained for mafic lavas from islands Robinson Crusoe and Alexander Selkirk. Trace element data confirm grouping where on Robinson Crusoe, group I represents the shield-building phase and group II represents post-shield building. Group III represents shield-building on Alexander Selkirk. Sub-parallel incompatible trace elements patterns among all samples suggest a common mantle origin. Shield-building groups I and III have nearly identical trace element concentrations, and lower Nb/Zr, Ba/Zr and La/YbN than the more enriched group II. Incompatible trace element modeling indicate group III was produced by the highest degree of partial melting, while low degrees of partial melting plus fractional crystallization account for group II. Robinson Crusoe lavas exhibit more radiogenic Pb isotopes (206Pb/204Pb: 19.163-19.292) than Alexander Selkirk (206Pb/204Pb: 18.939-19.228). The range of Sr-Nd-Pb and He isotopes result from variable degrees of partial melting of a slightly heterogeneous mantle plume source. The source contains an EM1 mantle component, and lies near the focus zone (FOZO). Group I represent young HIMU in the source of ocean island basalts while group III represent EM1. Juan Fernandez is unlike other high-3He/4He volcanic chains for lack of binary mixing between its low and high-3He/4He sources, showing no correlation between Sr-Nd-Pb and He isotopes.
Book Synopsis U, Th and Ra disequilibria, Sr, Nd and Pb isotope and trace element variations in Sunda arc lavas by : S. TURNER
Download or read book U, Th and Ra disequilibria, Sr, Nd and Pb isotope and trace element variations in Sunda arc lavas written by S. TURNER and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography and Index of Geology by :
Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1986 with total page 1354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geochemistry of Mafic Anatolian Lavas by : Megan Pickard
Download or read book Geochemistry of Mafic Anatolian Lavas written by Megan Pickard and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation provides in-depth analysis of major and trace element and Sr-Nd-Pb-Hf isotope compositions of mafic lavas in the Anatolian province. I combine incompatible and fluid-mobile trace elements and radiogenic lithophile isotope compositions to interpret the genesis of Sivas, Central Anatolia mafic lavas and the source components for mafic lavas throughout the Anatolian-circum-Mediterranean region. The data provide insight into the long-term (~1.8 Ga) geologic and tectonic history of the area. I use major and trace element compositions of Sivas mafic lavas to define two groups with contrasting petrogenetic histories. The first group is comprised of basalts and basaltic trachyandesites. Their low Ba/Nb, La/Nb, and Th/Nb values are similar to those observed in mantle-derived basalts and suggest they are derived from an asthenospheric mantle-dominated source. The second group are basanites that are enriched in incompatible trace elements relative to mid-ocean ridge basalts and have high Ba/Nb, La/Nb, and Th/Nb values indicative of a source in metasomatized sub-continental lithosphere containing hydrous phases such as amphibole. I also use the major element compositions of clinopyroxene phenecrysts in the mafic lavas to constrain the pressures of melting and differentiation for Sivas mafic lavas. Specifically clinopyroxene Al contents of the basaltic group suggest crystallization both at lower crustal depths (~10 kb) and at near-surface pressures. In contrast, basanite clinopyroxene indicate only one stage of crystal growth at around 5-8 kb prior to eruption. Sr-Nd-Hf-Pb isotope compositions of Sivas mafic lavas support and expand on the trace element findings. As seen in trace element compositions, the basaltic group consistently records higher asthenospheric contributions while the basanites with more radiogenic Sr and Pb low Nd isotope values originate from magmas with higher contributions from metasomatized sub-continental lithosphere. The Pb isotope signatures also record pseudo-binary mixing between shallow depleted asthenosphere, a regionally heterogeneous lithosphere, and a common mantle source with the isotopic characteristics of the C component or the circum-Mediterranean asthenosphere to form Sivas magmas. Calculated Nd model ages relative to depleted mantle indicate the incorporated lithosphere stabilized from the mantle between 1.8 and 1.2 Ga corresponding to assembly of Rodinia and Columbia supercontinents. Variations in source contributions and lithosphere stabilization ages appear to correlate with the geographic location of a modern strike-slip fault along the Kızılırmak River in the Sivas Basin, suggesting that Sivas mafic lavas record contributions from distinct lithospheric packages that are juxtaposed across a major crustal suture. One important implication of this result is that the oft-invoked subduction modification of mantle source regions contributing to Anatolian volcanism is not related to the more recent Miocene closure of Africa and Eurasia, but rather is an ancient inherited feature that has been present for an extended period of time.This dissertation also gives insight on science education and focuses on evidence for progression of knowledge with age and importance of targeted teaching. Science concepts for each grade level are intended to build on content learned in previous grades with the idea that students transition from a very simple to a very complex understanding of Earth and Space science by high school graduation.
Book Synopsis Summary of the Research Work of the Trace Elements Section, Geochemistry and Petrology Branch for the Period July 1-September 30, 1951 by : John C. Rabbitt
Download or read book Summary of the Research Work of the Trace Elements Section, Geochemistry and Petrology Branch for the Period July 1-September 30, 1951 written by John C. Rabbitt and published by . This book was released on 1952 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U.S. National Report 1987-1990 written by and published by . This book was released on 1991 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Geochemical and Isotopic Study of the Youngest Lavas from the Islands of Upolu and Savai'i, Samoa by : Alena Maria Catherine Bühler
Download or read book A Geochemical and Isotopic Study of the Youngest Lavas from the Islands of Upolu and Savai'i, Samoa written by Alena Maria Catherine Bühler and published by . This book was released on 2011 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report major and trace element abundances and Hf, Pb, and Nd isotopic ratios for eight of the youngest rejuvenation stage lavas from the Samoan Islands of Upolu and Savai'i. The extensive and voluminous amount of rejuvenation stage volcanism on the Samoan islands, especially on the islands of Savai'i and Upolu, has made these islands key in the understanding of rejuvenation magmatism. The six lavas from Upolu are basanites, whereas the two lavas from Savai'i are alkali basalts. With the exception of one basanite with 7.4 wt. % MgO, all of the samples are relatively primitive (MgO = 10.5 to 12.2 wt. %) and show little evidence of fractionation beyond olivine control. However, variations in major element abundances at a given MgO value indicate changes in the parental melt composition. This interpretation is confirmed by wide variations in ratios of incompatible trace elements (e.g., Nb/La or Ce/Yb). On a primitive mantle normalized trace element diagram, the lavas have relatively constant, low abundances of heavy rare-earth elements (e.g., Yb) due to the presence of residual garnet in the mantle source region. The [lower case epsilon]Nd ( -0.26 to +2.93) and [lower case epsilon]Hf (+3.82 to +7.17) values, and Pb isotope ratios (e.g., 206Pb/2044Pb = 18.57-18.88) vary significantly but plot within the range of published data for rejuvenation stage lavas from these islands. On a plot of [lower case epislon]Nd vs. 206Pb/204Pb, the new Upolu and Savai'i analyses make a distinctive positive correlation that overlaps with previous analyses of rejuvenation stage lavas from these islands. Interestingly, this trend is distinct from the ones defined by many of the purported Upolu and Savai'i shield stage lavas. These data will help to better understand the origin of rejuvenation stage magmatism.
Download or read book Noble Gases written by Donald P. Porcelli and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 47 of Reviews in Mineralogy and Geochemistry introduces to Noble Gases. Although the mass spectrometry principles are not complex, the tricks involved in getting better data are often self taught or passed on by working with individuals who themselves are pushing the boundaries further. Furthermore, much of the exciting new science is linked with technical developments that allow us to move beyond the current measurement capabilities. Be they better crushing devices, laser resonance time of flight, multiple collection or compressor sources - the technical issues are central to progress. Contents: Noble Gases – Noble Science An Overview of Noble Gas Geochemistry and Cosmochemistry Noble Gases in the Solar System Noble Gases in the Moon and Meteorites: Radiogenic Components and Early Volatile Chronologies Cosmic-Ray-Produced Noble Gases in Meteorites Martian Noble Gases Origin of Noble Gases in the Terrestrial Planets Noble Gas Isotope Geochemistry of Mid-Ocean Ridge and Ocean Island Basalts: Characterization of Mantle Source Reservoirs Noble Gases and Volatile Recycling at Subduction Zones The Storage and Transport of Noble Gases in the Subcontinental Lithosphere Models for the Distribution of Terrestrial Noble Gases and the Evolution of the Atmosphere Production, Release and Transport of Noble Gases in the Continental Crust Tracing Fluid Origin, Transport and Interaction in the Crust Noble Gases in Lakes and Ground Waters Noble Gases in Ocean Waters and Sediments Cosmic-Ray-Produced Noble Gases in Terrestrial Rocks: Dating Tools for Surface Processes K-Ar and Ar-Ar Dating (U-Th)/He Dating: Techniques, Calibrations, and Applications
Book Synopsis Summary of the Research Work of the Trace Elements Section, Geochemistry and Petrology Branch for the Period October 1-December 31, 1951 by : John C. Rabbitt
Download or read book Summary of the Research Work of the Trace Elements Section, Geochemistry and Petrology Branch for the Period October 1-December 31, 1951 written by John C. Rabbitt and published by . This book was released on 1952 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Origin of Deccan Trap lavas by : P.C. LIGHTFOOT
Download or read book Origin of Deccan Trap lavas written by P.C. LIGHTFOOT and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summary of the Research Work of the Trace Elements Section, Geochemistry and Petrology Branch, for the Period April 1, 1948 - December 31, 1950 by : John C. Rabbitt
Download or read book Summary of the Research Work of the Trace Elements Section, Geochemistry and Petrology Branch, for the Period April 1, 1948 - December 31, 1950 written by John C. Rabbitt and published by . This book was released on 1951 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Variation in Incompatible Trace Element and Isotopic Compositions in Mariana Trough Lavas by : Robert F. Gribble
Download or read book Variation in Incompatible Trace Element and Isotopic Compositions in Mariana Trough Lavas written by Robert F. Gribble and published by . This book was released on 1996 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Isotopic and Trace Element Geochemistry of Lavas from the Northern Mariana and Southern Volcano Arcs by : Ping-Nan Lin
Download or read book Isotopic and Trace Element Geochemistry of Lavas from the Northern Mariana and Southern Volcano Arcs written by Ping-Nan Lin and published by . This book was released on 1989 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Trace Element Constraints on the Origin of the Baffin Bay Lavas by : Isabelle Robillard
Download or read book Trace Element Constraints on the Origin of the Baffin Bay Lavas written by Isabelle Robillard and published by . This book was released on 1991 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The picritic volcanic suite of Baffin Island is comprised of two different types of magmas which are analogous to N and E-MORB. Although these two picritic lavas-types are spatially intermixed in the stratigraphic succession, they are distinct in terms of light rare earth elements (LREE), K/Ti and $ sp[symbol]$Sr/$ sp[symbol]$Sr ratios. N-type lavas are depleted in LREE and have K/Ti ratio 0.5 and $ sp[symbol]$Sr/$ sp[symbol]$Sr ratios ranging between 0.7032 and 0.7039. Olivine fractionation and partial melting models involving a single homogeneous source can not reproduce the trace element differences between these two magma types. The generation of N and E-type magmas is most easily explained by small scale mantle heterogeneity. A possible model for the nature of the source is that of the head of a mantle plume which has an entrained depleted mantle." --
Book Synopsis Trace Elements and Organic Compounds in Sediment and Fish Tissue from the Great Salt Lake Basins, Utah, Idaho, and Wyoming, 1998-99 by : Kidd M. Waddell
Download or read book Trace Elements and Organic Compounds in Sediment and Fish Tissue from the Great Salt Lake Basins, Utah, Idaho, and Wyoming, 1998-99 written by Kidd M. Waddell and published by . This book was released on 2004 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enriched Geochemical Signatures in Aleutian and Indonesian Arc Lavas by : Julie Dianne Morris
Download or read book Enriched Geochemical Signatures in Aleutian and Indonesian Arc Lavas written by Julie Dianne Morris and published by . This book was released on 1984 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pb, Sr, and Nd Isotope Geochemistry of Young Lavas from Loihi Seamount, Hawaii by : Jennifer Anne Duncan
Download or read book Pb, Sr, and Nd Isotope Geochemistry of Young Lavas from Loihi Seamount, Hawaii written by Jennifer Anne Duncan and published by . This book was released on 2008 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
