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I. Predicting equilibrium stable iso...

Schauble, Edwin Arthur.

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I. Predicting equilibrium stable isotope fractionations of iron, chlorine, and chromium. II. Oxygen-isotope investigation of Mesozoic and Cenozoic granitoids of the northeastern Great Basin, Nevada and Utah.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	I. Predicting equilibrium stable isotope fractionations of iron, chlorine, and chromium. II. Oxygen-isotope investigation of Mesozoic and Cenozoic granitoids of the northeastern Great Basin, Nevada and Utah./
作者:	Schauble, Edwin Arthur.
面頁冊數:	189 p.
附註:	Adviser: Hugh P. Taylor, Jr.
Contained By:	Dissertation Abstracts International63-08B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3062282
ISBN:	0493779736

I. Predicting equilibrium stable isotope fractionations of iron, chlorine, and chromium. II. Oxygen-isotope investigation of Mesozoic and Cenozoic granitoids of the northeastern Great Basin, Nevada and Utah.
Schauble, Edwin Arthur.

I. Predicting equilibrium stable isotope fractionations of iron, chlorine, and chromium. II. Oxygen-isotope investigation of Mesozoic and Cenozoic granitoids of the northeastern Great Basin, Nevada and Utah. - 189 p.

Adviser: Hugh P. Taylor, Jr.

Thesis (Ph.D.)--California Institute of Technology, 2002.

Theoretical studies of the stable isotope geochemistry of iron, chlorine, and chromium are presented, with the goal of providing a framework to help interpret new measurements and identify promising areas for future study. In addition, new oxygen-isotope measurements of Mesozoic and Cenozoic granites from the northeastern Great Basin are used to constrain the temporal evolution of magmatic sources in the region.

ISBN: 0493779736Subjects--Topical Terms:

545717
Biogeochemistry.

I. Predicting equilibrium stable isotope fractionations of iron, chlorine, and chromium. II. Oxygen-isotope investigation of Mesozoic and Cenozoic granitoids of the northeastern Great Basin, Nevada and Utah.
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100 1 $a Schauble, Edwin Arthur. $3 1252880
245 1 0 $a I. Predicting equilibrium stable isotope fractionations of iron, chlorine, and chromium. II. Oxygen-isotope investigation of Mesozoic and Cenozoic granitoids of the northeastern Great Basin, Nevada and Utah.
300 $a 189 p.
500 $a Adviser: Hugh P. Taylor, Jr.
500 $a Source: Dissertation Abstracts International, Volume: 63-08, Section: B, page: 3623.
502 $a Thesis (Ph.D.)--California Institute of Technology, 2002.
520 $a Theoretical studies of the stable isotope geochemistry of iron, chlorine, and chromium are presented, with the goal of providing a framework to help interpret new measurements and identify promising areas for future study. In addition, new oxygen-isotope measurements of Mesozoic and Cenozoic granites from the northeastern Great Basin are used to constrain the temporal evolution of magmatic sources in the region.
520 $a Natural variations in the stable isotope compositions of a number of elements heavier than sulfur have recently been measured. Theoretical calculations for three of these elements (iron, chlorine, and chromium) are made using published measurements of vibrational frequencies, in combination with empirical and <italic>ab initio</italic> force-field estimates of unknown frequencies. The calculations suggest that a number of natural processes can drive stable isotope fractionations of heavy elements, including oxidation/reduction of dissolved metals, and bond-partner exchange reactions. At equilibrium and 25°C, <super>56</super>Fe/<super>54</super>Fe will be &sim;5&permil; higher in [Fe(H2O)6]<super>3+</super> than in coexisting [Fe(H 2O)6]<super>2+</super>, <super>53</super>Cr/<super>52</super>Cr will be &sim;6–7&permil; higher in [CrO4]<super>2− </super> than in coexisting [Cr(H2O)6]<super>3+</super> or Cr2O3, and aqueous Cl<super>−</super> will be &sim;2–3&permil; lighter than alteration minerals like mica and amphibole.
520 $a Whole-rock <super>18</super>O/<super>16</super>O measurements of granites in the northeastern Great Basin suggest that different source rocks were melted during three stages of magmatism. Radiogenic-isotope measurements were previously made on the same samples. Late Cretaceous (90–70 Ma) granites have high δ<super> 18</super>O (+9.3 to + 12.1), high <super>87</super>Sr/<super>86</super>Sri (0.711–0.734), and low ϵNd (≤−13) indicating a source dominated by ancient, evolved crustal sediments. Late Jurassic plutons span a larger range of δ<super>18</super>O values (+7.2 to +13.2) despite having lower <super>87</super>Sr/<super>86</super>Sri (≤0.711) and higher ϵNd (≥−6.5), suggesting that high-δ<super>18</super>O sediment was assimilated into mafic parent melts. The 40–25 Ma Cenozoic plutons (δ<super>18</super>O = +7.0 to +9.7, <super>87</super>Sr/<super>86</super>Sr i = 0.707 to 0.717, ϵNd = −13.2 to −26.3) appear to be dominated by continental basement-type material. Cenozoic plutons can be subdivided into a higher δ<super>18</super>O (>+8.6) southern group and a lower δ<super>18</super>O (<+8.2) northern group across a boundary previously observed with radiogenic isotope measurements. Northern Cenozoic granites suggest that Archean basement underlies part of the Great Basin.
590 $a School code: 0037.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Geochemistry. $3 539092
650 4 $a Geology. $3 516570
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690 $a 0425
690 $a 0996
710 2 0 $a California Institute of Technology. $3 726902
773 0 $t Dissertation Abstracts International $g 63-08B.
790 $a 0037
790 1 0 $a Taylor, Hugh P., Jr., $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3062282