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CAA: U-Pb Geochronology of Squantum 'Tillite' and Related Rocks Around Boston, MA: Implications for Terminal Proterozoic Glaciation and Supercontinent Breakup

CAA: U-Pb Geochronology of Squantum 'Tillite' and Related Rocks Around Boston, MA: Implications for Terminal Proterozoic Glaciation and Supercontinent Breakup
CAA:马萨诸塞州波士顿周围 SQuantum Tillite 及相关岩石的 U-Pb 地质年代学:对元古代末期冰川作用和超大陆分裂的影响
批准号:
9628520
负责人:
Margaret Thompson
金额:
$5.0万
依托单位:
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
1996
资助国家:
美国
项目状态:
已结题
起止时间:
1996-08-01 至 1998-01-31

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中文摘要
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英文摘要
Thompson 9628520 For more than a century, geologists have congregated at the Squaw Head seacliff in Quincy, Massachusetts to argue over the possible glacial origin of the Squantum "Tillite". Although recent sedimentological opinion has finally titled toward glaciomarine deposition, much remains to be learned by dating this rock. Squantum age data, for example, will provide the first radiometric evidence for the timing of sedimentary-volcanic events post-dating the well known ca. 625-590 Ma Avalonian magmatic arc complex around Boston. The Squantum "Tillite" will be dated in the Radiogenic Isotope Laboratory at MIT using methods of high precision U-Pb zircon geochronology. Volcanic rock clasts as well as detrital zircons from Squantum diamictite will be analyzed to fix its maximum depositional age. Volcanic flows interbedded with a conglomeratic Squantum sequence farther south in Houghs Neck, Quincy will also be dated. This result will constrain the age of deposition, and thus the age glaciation in this area, more directly. A broader view of Squantum provenance will be sought via detrital zircon studies. For a Principal Investigator who has spent twenty years teaching undergraduates, the opportunity presented by this project to learn the methods of U-Pb geochronology in MIT's Radiogenic Isotope Laboratory represents a major career advancement. Much broader and more stimulating research questions will certainly arise once high precision age determinations can be integrated with existing field, petrographic and geochemical data. The results of such research will surely come full circle by returning an intellectually energized instructor to Wellesley classrooms.
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Collaborative Research: Stratigraphic Resolution as Key to Tectonic Synthesis in the Southeastern New England Avalon Zone Around Boston, Massachusetts
  • 批准号:
    0125477
  • 项目类别:
    Standard Grant
  • 资助金额:
    $9.78万
  • 财政年份:
    2002
  • 负责人:
    Margaret Thompson
  • 依托单位:
Refining the Age of Neoproterozoic Glaciation in the Boston Basin, Massachusetts: New Uranium-Lead (U-Pb) Zircon Constraints on the Last Snowball Earth
  • 批准号:
    0001134
  • 项目类别:
    Standard Grant
  • 资助金额:
    $5.5万
  • 财政年份:
    2000
  • 负责人:
    Margaret Thompson
  • 依托单位:
COLLABORATIVE RESEARCH: Neoproterozoic-Lower Paleozoic Evolution of the Southeastern New England Avalon Zone aroundBoston, MA: Tests from Geochronology and Paleomagnetism
  • 批准号:
    9725804
  • 项目类别:
    Standard Grant
  • 资助金额:
    $4.61万
  • 财政年份:
    1998
  • 负责人:
    Margaret Thompson
  • 依托单位:
Japan (JSPS) Postdoctoral Program: Extension of the Relay Model of Fault Detection
  • 批准号:
    9011093
  • 项目类别:
    Standard Grant
  • 资助金额:
    $0.0万
  • 财政年份:
    1990
  • 负责人:
    Margaret Thompson
  • 依托单位:
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    余江芳
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