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GEOCHEMICAL AND STABLE ISOTOPIC EVALUATION OF FENGHUOSHAN GROUP LACUSTRINE CARBONATES, NORTH-CENTRAL TIBET: IMPLICATIONS FOR THE PALEOALTIMETRY OF THE MID-TERTIARY TIBETAN PLATEAU

Cyr, Andrew J
http://rave.ohiolink.edu/etdc/view?acc_num=miami1080329128

Abstract Details

2004, Master of Science, Miami University, Geology and Environmental Earth Science.
Comprehensive analysis of lacustrine carbonates from the Eocene-Oligocene Fenghuoshan Group, north-central Tibet, allows interpretation of the paleolimnology and paleoaltitude of the north-central Tibetan Plateau during the mid-Tertiary. Sedimentologic evidence suggests carbonate deposition occurred in shallow lacustrine systems. Stable O and C isotopic analysis of Fenghuoshan carbonates show δ18O values ranging from –11.7‰ to –10.26 (PDB), and δ13C values between –7.13‰ and –2.22‰ (PDB). Poor correlation between these isotopic systems (r2 = 0.0219)suggests open lakes during carbonate deposition. Mineralogy and Mg/Ca ratios indicate fresh water conditions. XRD and Mg/Ca data combined with δ18O values and petrography show little diagenetic alteration. These data indicate that the oxygen isotopic composition of Fenghuoshan carbonates represents the oxygen isotopic composition of meteoric water feeding Fenghuoshan lakes at the time of deposition. Oxygen isotope fractionation model calculations using this meteoric water composition indicate the hypsometric mean elevation of basins feeding Fenghuoshan lakes was ~2 km.
Brian Currie (Advisor)
82 p.
Geology
Tibet; Fenghuoshan; paleoelevation; lacustrine carbonate; stable isotope geochemistry

Recommended Citations

Citations

  • Cyr, A. J. (2004). GEOCHEMICAL AND STABLE ISOTOPIC EVALUATION OF FENGHUOSHAN GROUP LACUSTRINE CARBONATES, NORTH-CENTRAL TIBET: IMPLICATIONS FOR THE PALEOALTIMETRY OF THE MID-TERTIARY TIBETAN PLATEAU [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1080329128

    APA Style (7th edition)

  • Cyr, Andrew. GEOCHEMICAL AND STABLE ISOTOPIC EVALUATION OF FENGHUOSHAN GROUP LACUSTRINE CARBONATES, NORTH-CENTRAL TIBET: IMPLICATIONS FOR THE PALEOALTIMETRY OF THE MID-TERTIARY TIBETAN PLATEAU. 2004. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1080329128.

    MLA Style (8th edition)

  • Cyr, Andrew. "GEOCHEMICAL AND STABLE ISOTOPIC EVALUATION OF FENGHUOSHAN GROUP LACUSTRINE CARBONATES, NORTH-CENTRAL TIBET: IMPLICATIONS FOR THE PALEOALTIMETRY OF THE MID-TERTIARY TIBETAN PLATEAU." Master's thesis, Miami University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=miami1080329128

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Miami University and OhioLINK.