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- W2264434756 abstract "The Coastal Volcanic belt (CVB) extends from Massachusetts to New Brunswick and comprises bimodal volcanic rocks associated with continental extension. The Silurian Passamaquoddy Bay subbelt is located in the northern part of the CVB in Maine and New Brunswick. The Passamaquoddy Bay subbelt is divided by the Oak Bay fault. Exposures on either side of the fault have been correlated based on similar lithologies and faunal assemblages. This study compares volcanic style across the subbelt, focusing on phreatomagmatic volcanism, as a distinguishing characteristic. The Passamaquoddy Bay subbelt in Eastport, Maine, includes sedimentary, mafi c tuff, mafi c fl ow, and felsic tuff facies. The sedimentary facies is dominated by siltstone and fi ne-grained sandstone with minor conglomerate. Sedimentary features are characteristic of a littoral depositional environment. Mafi c tuffs are variable in composition but are generally characterized by a high percentage of lithic clasts (up to 90%). The low abundance and scoriaceous nature of the magmatic fragments is consistent with phreatomagmatic eruptions. Bedding structures indicate variable depositional processes including surge, airfall and lahars that may represent part of a maar or tuff cone. The mafi c fl ows are fi ne-grained with structures interpreted to be vesicular fl ow tops, massive interiors, fl ow bottom breccias, and in situ brecciation. These rocks are interpreted to be Hawaiian-type fl ows that interacted with water. Felsic tuffs contain a high percentage (up to 90%) of juvenile fragments and < 10% accidental lithic clasts. The high abundance of bubble-wall and platy glass shards and pumice fragments indicates a volatile-rich magmatic eruption. The alignment of elongate pumice clasts and lack of other bedding structures is characteristic of pyroclastic fl ows. The area is locally intruded by fi ne-grained mafi c dykes and sills. These intrusions show variable contact relationships with the sedimentary rocks and represent multiple intrusive events with evidence for non-explosive interaction with wet and unconsolidated sediment. This style of volcanism is compared to the Passamaquoddy Bay subbelt in New Brunswick. The Passamaquoddy Bay subbelt is characterized by variable styles of volcanism, but typically indicating the interaction with water in an intertidal environment. These results suggest a signifi cant shallow marine extensional basin within the Northern Appalachians during the Silurian, with variable eruptive styles of bimodal volcanism." @default.
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- W2264434756 date "2005-01-01" @default.
- W2264434756 modified "2023-09-27" @default.
- W2264434756 title "Abstract: Phreatomagmatism of the Silurian Passamaquoddy Bay subbelt, Maine and New Brunswick" @default.
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