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(FULLY BOOKED) Ediacaran Bedrock of Greater Boston, Massachusetts: Elements of an Avalonian magmatic arc

(FULLY BOOKED) Ediacaran Bedrock of Greater Boston, Massachusetts: Elements of an Avalonian magmatic arc

Sunday 12th August 08:30 - 18:00
Contacts: Margaret D. Thompson, Catherine L. Summa
Price: US$35

Full details (PDF)

Batholithic expanses of granite locally overlain by trilobite-bearing Cambrian shale provided early evidence linking southeastern New England with Precambrian rocks in Newfoundland's Avalon Peninsula, but reliable U-Pb isotopic age determinations necessary for detailed correlation have only emerged only relatively recently. This one-day trip will proceed stratigraphically from plutonic and volcanic basement rocks on the south side of the Boston Basin through Roxbury Conglomerate and associated Brighton igneous units within the Basin. Field trip stops at Worlds End (Hingham), Squantum Neck (Quincy), Franklin Park (Boston) and Dane Park (Brookline) will highlight U-Pb zircon geochronology showing that conglomerate lying unconformably on 609.5 Ma Dedham Granite is part of the 597-593 Ma Lynn-Mattapan Volcanic Complex and demonstrating a 595-584 Ma age range for the Roxbury proper. Discussion throughout the day will revisit age-old topics like possible glacial origin of the Squantum deposits and also emphasize implications of the new age constraints for Avalonian tectonics both in and beyond southeastern New England. Logistics: Meet at Boylston Street entrance to Hynes Convention Center for 8:30AM departure. Fee includes lunch, admission to Worlds End Reservation and field guide.

White Iron Conferences Limited, a company registered in England, No. 10437336. Registered address: 11 Sturton Street, Cambridge, CB1 2SN, UK. Tel: +44 1223 852663. Email: helpdesk@goldschmidt.info

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