Isotopic and chemical studies of early crustal metasedimentary rocks

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Harvard University , Cambridge, MA
Rocks, Sedimentary -- Composi
SeriesNASA-CR -- 182711., NASA contractor report -- NASA CR-182711.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15288294M

Get this from a library. Isotopic and chemical studies of early crustal metasedimentary rocks. [United States. National Aeronautics and Space Administration.;]. Detrital zircon ages and Hf isotopic compositions of metasedimentary rocks in the Wuqia area of Southwest Tianshan, NW China: implications for the early Paleozoic tectonic evolution of the.

Subduction zones are avenues for the delivery of crustal, atmospheric, and oceanic (including organic) components to the mantle and understanding of subduction zone chemical and isotopic cycling Author: Gray Bebout. Precambrian Crustal Blocks in Minnesota Neodymium Isotope Evidence from Basement and Metasedimentary Rocks ByS.R.

Hemming,1 '2 G.N. Hanson,1 andS.M. McLennan1 Abstract A Sm-Nd survey of Precambrian granitic and metasedi- mentary rocks collected from several geophysically defined blocks in central Minnesota confirms the presence of some fun­Cited by: 3.

They were not derived by melting of local metasedimentary rocks as suggested by previous workers, but by melting of a more juvenile source at depth. Post-orogenic granites have higher ε Nd (T) (~ +) than the syn-orogenic granitoids, indicating their derivation from a deeper crustal level where juvenile crust may by: Though crustal rocks show a wide range in Re and Os concentrations and Os isotopic composition, the data for SD 75 lie well within the field seen for a variety of crustal rocks (e.g., Koide et al., ; Esser and Turekian, ; Ravizza, ; Esperança et al., ; Saal et al., ; Widom et al., ).

Lacking direct samples of the. In geology, metasedimentary rock is a type of metamorphic a rock was first formed through the deposition and solidification ofthe rock was buried underneath subsequent rock and was subjected to high pressures and temperatures, causing the rock to overall composition of a metasedimentary rock can be used to identify the original sedimentary rock, even.

Early Proterozoic crustal evolution: Geochemical and Nd-Pb isotopic evidence from metasedimentary rocks, southern North America.

Geochimica et Cosmochimica Acta, 59, Author: Shaik A. Rashid, Shamshad Ahmad, Naqeebul Islam, Javid A. Ganai. The metamorphic belt in central Jiangxi, located in the compound terrain within the Cathaysia, Yangtze Block and Caledonian fold zone of South China, is composed dominantly of meta-argillo-are-naceous rocks, with minor amphibolite.

These rocks underwent amphibolite-facies metamorphism. The meta-argillo-arenaceous rocks show large variations in major element Cited by: 6.

@article{osti_, title = {Isotopic and geochemical studies of fluid-rock interactions and the chemical evolution of the oceans}, author = {Derry, L.A.}, abstractNote = {The isotopic compositions of Sr and Nd, and the abundances of rare earth elements (REE) are used to study various types of fluid-rock interactions in the Earth's crust.

This study examines the original nature, tectonic setting, and evolution of Paleoproterozoic metasedimentary rocks of the North Liaohe and Laoling groups of the northern segment of the Jiao–Liao–Ji Belt, in the northeastern margin of the Eastern Block of the North China Craton, using new petrological, whole-rock geochemical, geochronological, and Lu–Hf isotope by: Sulfur on the Early Earth.

Sulfur on the early Earth has been studied, because it gives insight into the oxidation state of the early atmosphere ocean system (Canfield and Raiswell, ). The occurrence of evaporitic sulfate from the Ga as in the Warrawoona Group of Western Australia suggests that sulfate must have been present in.

Geochemical Constraints on the Petrogenesis of the Metasedimentary Rocks Forming the Basement of the Shillong Plateau, Northeast India Authors M. Faruque HussainAuthor: M. Faruque Hussain, V.

Vanthangliana, M. Mondal. Geologic unit mapped in Arizona: Metasedimentary rocks, mostly derived from sandstone and shale, with minor conglomerate and carbonate rock.

Includes quartz-rich, mostly nonvolcanic Pinal Schist in southeastern Arizona and variably volcanic-lithic sedimentary rocks in the Yavapai and Tonto Basin supergroups in central Arizona. ( Ma).

Metasedimentary rocks, undivided - Graywacke, slate, local units of conglomerate, arenite, graphitic slate, fine-grained felsic volcanogenic, and volcaniclastic rocks, lean oxide iron-formation and its metamorphic equivalents. Includes the Knife Lake Group and the Lake Vermilion Formation in northeastern Minnesota.

the other two plutons. The Nd model ages of the basement rocks (~Ga) are slightly older than those of the plutons (~Ga). The initial Sr and Nd isotopic ratios of the plutons can be modeled by the mixing between the mid-oceanic ridge basalt-like depleted mantle component and the crustal component represented by basement rocks, which is.

These rocks form the basement on which the Moine Supergroup and Torridonian sediments were deposited The Moine Supergroup consists of a thick and extensive sequence of Neoproterozoic siliciclastic metasedimentary rocks, dominated by psammites with. Abstract Some graphite contained in the billion-year-old metasedimentary rocks of the Isua Supracrustal Belt, Western Greenland, is depleted in 13 C and has been interpreted as evidence for early life.

However, it is unclear whether this graphite is primary, or. Provisional Dating of Metasedimentary Rocks in South Katsina State, Northwestern Nigeria: Studies in Proterozoic Crustal Evolution Kankara, I.

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A1* and Farouk, H. A2 Accepted 14 September, 1Department of Geography and Regional Planning, Federal University Dutsin-Ma, Katsina State, Nigeria. deposition of metasedimentary rocks of the TCC, most probably pointing to Neoproterozoic to early Cambrian. Paper by Dörr et al. () summarized the geochrono-logical evolution of the Teplá–Barrandian Unit in early Cambrian to Neoproterozoic times.

Methods and sample description The TCC metasedimentary rocks were sampled along. The isotopic data from the Jurassic-Early Cretaceous plutonic suite do not reflect the presence of this boundary, suggesting that the isotopic systematics of this plutonic suite may not have been controlled by the same variations in crustal and/or mantle lithospheric structure at depth.}, doi = {/()CO;2.

The Castelo Branco granitic pluton is located within the Central Iberian Zone (CIZ), the innermost zone of the Iberian Variscan Belt.

This pluton is exposed over an area of km 2, with a mean diameter of 19 km, and consists of five late-tectonic Variscan granitic bodies, intruding the schist-greywacke complex (CXG) (Fig. 1).In the NE border, it contacts with a medium-grained biotite Author: Antunes Imhr.

Thin (3–20 m), picritic to noritic sills are found in the Proterozoic metasedimentary footwall rocks of the Duluth Complex, Minnesota. The sills were emplaced prior to the major intrusions that comprise the Duluth Complex, and underwent contact metamorphism along with the country rocks.

Oxygen, hydrogen, and sulfur isotopic compositions of the sills indicate a varied history of isotopic. Evidence for biogenic graphite in early Archaean Isua metasedimentary rocks Yoko Ohtomo1, Takeshi Kakegawa1, Akizumi Ishida1, Toshiro Nagase1 and Minik T.

Rosing2 1Natural Resources and Environmental Geochemistry Research Group, Division of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Japan 2Nordic Center for Earth.

A Geochemical and Isotopic Investigation of Metasedimentary Rocks from the North Caribou Greenstone Belt, Western Superior Province, Canada Jason Duff A thesis submitted to the Faculty of Graduate and Postdoctoral Studies in partial fulfillment of the requirements for the degree of in Earth Sciences Ottawa-Carleton Geosciences Centre.

We present a detailed study on element mobility during prograde metamorphism of metasedimentary rocks of the eastern Mt.

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Lofty Ranges, South Australia. Mineral and bulk rock compositions were monitored across a regional metamorphic gradient from ≈– °C to migmatite grade (≈– °C) at ≈– GPa, where pervasive up-temperature fluid flow during metamorphism has been Cited by: Quick NavTop About Metasedimentary rock Classification Sub-divisions Internet Links Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy.

Metasedimentary and metavolcanic rocks are present in three successions ranging in age from Archean (about 2, Ma) to Early Proterozoic (about 2, Ma). These three successions include, from oldest, the Overland Creek Gneiss, the Phantom Lake Metamorphic Suite, and the Snowy Pass Supergroup.

OVERLAND CREEK GNEISSCited by: Early Proterozoic crustal evolution: Geochemical and NdPb isotopic evidence from metasedimentary rocks, southwestern North America S.M. McLennan, S.R.

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Hemming, S.R. Taylor, K.A. Eriksson Geochimica et Cosmochimica Acta 59 (6), Cited by: Evolution early Mesoproterozoic metasedimentary rocks with Proterozoic basin rocks in the western US, placing important constraints on the widely debated continental reconstructions prior to opening of the Proto Pacific Ocean.

and sediment source regions. This will be followed by metamorphic analysis on P-T sensitive metasedimentary. Constraining the timing of tectonothermal events in the Proterozoic Miaowan Ophiolite Complex (MOC) and associated rocks in the southern Huangling dome, Yangtze craton, is critical for understanding late Mesoproterozoic and Neoproterozoic tectonic evolution (ca.

– Ga) of South China and its relationship with the formation of the Rodinian by: A sequence of Early Proterozoic metasedimentary rocks near the town of Philbrook, at the northwestern edge of the Animikie basin, has been correlated with the lower part of the Mille Lacs Group.

These rocks, which were deformed during the Penokean orogeny, contain elevated amounts of tourmaline and thin beds of tourmalinite, which have been.describe various metasedimentary sequences and focus attention on some of the structural,metamorphic and intru­ sive events which have affected them.

Some of the major intrusionspresent in the areaare shown in FigThe conclu­ sions reached are primarily based on field observations but also incorporate the results of the few isotopic age studiesFile Size: 7MB.