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Lacustrine Deposits of the Jurassic East Berlin Formation, Hartford Basin, Newark Supergroup: Balance-filled or Under-filled Lakes?

Conti, Alexander A.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1469716254

Abstract Details

2016, Master of Science (MS), Ohio University, Geological Sciences (Arts and Sciences).
The lacustrine, playa, and alluvial Jurassic East Berlin Formation is one of four understudied sedimentologic units in the Hartford Basin, a fault-bounded half-graben in southern New England. Past studies identified six complete lake successions, or source rocks with kerogen-rich black shale, in the southern and northern extents of the upper 107 m of the East Berlin. A geologic analysis of eight fresh cores, collectively penetrating the entire East Berlin for the first time in the central region of the basin, has synthesized the (1) sedimentology, (2) clay-sized mineralogy, (3) stratigraphy, and (4) biogeochemistry of an otherwise poorly-understood sedimentary formation. Facies are analogous to those found by previous workers and characterize three main depositional environments—(a) sheetflood-dominated sandflats, (b) pedogenically-altered dry playa mudflats, and (c) shallow and deep lakes. Travertine is found in the lower East Berlin for the first time in central Connecticut. Eight complete lake successions, the upper six of which are correlative to exposures in the southern and northern regions of the basin, are dominated by chlorite-smectite with 50% smectite layers (lakes 1a and 1b), illite-smectite with 20% smectite layers (lakes 2, 5, 7, and 8), and illite-smectite with 90% smectite layers (lakes 3, 4, and 6). Biomarker results are inconclusive and ongoing. These data suggest a gradient from balance-filled (lakes 1a and 1b) to under-filled (lakes 2-8) conditions during East Berlin time, which records a complex dynamic of tectonic and climatic forcings.
Elizabeth Gierlowski-Kordesch (Advisor)
Dina Lopez (Committee Member)
Alycia Stigall (Committee Member)
185 p.
Geochemistry; Geology; Sedimentary Geology
Geology; Sedimentology; Geochemistry; Jurassic; Hartford Basin; Newark Supergroup; Limnogeology; Biomarkers

Recommended Citations

Citations

  • Conti, A. A. (2016). Lacustrine Deposits of the Jurassic East Berlin Formation, Hartford Basin, Newark Supergroup: Balance-filled or Under-filled Lakes? [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1469716254

    APA Style (7th edition)

  • Conti, Alexander. Lacustrine Deposits of the Jurassic East Berlin Formation, Hartford Basin, Newark Supergroup: Balance-filled or Under-filled Lakes? 2016. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1469716254.

    MLA Style (8th edition)

  • Conti, Alexander. "Lacustrine Deposits of the Jurassic East Berlin Formation, Hartford Basin, Newark Supergroup: Balance-filled or Under-filled Lakes?" Master's thesis, Ohio University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1469716254

    Chicago Manual of Style (17th edition)

ohiou1469716254
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This open access ETD is published by Ohio University and OhioLINK.