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Book Chapter

Baltimore Canyon Trough

By
T.D. Crutcher
T.D. Crutcher
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Published:
January 01, 1983

Abstract

The Baltimore Canyon Trough is an elongate sedimentary basin bounded on the north by the Long Island Platform and on the south, less precisely, by a basement promontory offshore from Cape Hatteras. The Trough probably has been open to the sea to the east through most of its history.

The seismic line is approximately 75 mi (120 km) long and extends from a point 20 mi (32 km) from the New Jersey coastline eastward to the 3,000 ft (914 m) isobath. The reflector at 1.84 secs, at the west end of the line, probably represents the 'breakup unconformity' of Falvey (1974) which is inferred to be Early Jurassic in age here. Beneath the unconformity the section may be comprised of Paleozoic metamorphic or igneous rocks and/or Triassic to Lower Jurassic synrift continental clastics. Above the unconformity are Lower Jurassic evaporites overlain by a wedge of Middle Jurassic through Lower Cretaceous Neocomian shelf carbonates and clastics. The shelf sequence is 25,000 to 30,000 ft (7,620 to 9,144 m) thick in the center of the trough. It was built during a progradational mega-cycle that advanced the shelf edge 25 mi (40 km) seaward from its initial position following plate separation. Most of the post-Neocomian section is composed of shallow marine clastics deposited during the long Cretaceous period of relative sea-level rise.

Near the center of the seismic line is the "Great Stone Dome." This ultramafic body (lamprophere has been identified in well cuttings) intruded the Baltimore Trough during middle Early Cretaceous time. Some intrusive bodies of inferred igneous origin seaward of Georges Bank Basin, 270 mi (435 km) to the east-northeast, were also emplaced during Early Cretaceous time. These bodies are on trend with the Kelvin Seamounts and the Kelvin Fault Zone.

After a period of erosion which nearly base-leveled the Dome, a blanket of lower Lower Cretaceous clastic rocks was deposited across the uplift area before rejuvenation of the Dome occurred during Late Cretaceous and early Tertiary time. The nearly circular dome has an areal closure of nearly 47,000 acres at the Upper Cretaceous level. Seven exploratory wells have been drilling on the anomaly by industry. None is believed to have encountered significant hydrocarbon shows.

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Contents

AAPG Studies in Geology

Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces

A. W. Bally
A. W. Bally
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American Association of Petroleum Geologists
Volume
15
ISBN electronic:
9781629810188
Publication date:
January 01, 1983

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