Site 108: Continental Slope

Hollister, C.D.; Ewing, John; Habib, Daniel; Hathaway, John C.; Lancelot, Y.; Luterbacher, Hanspeter; Paulus, F.J.; Poag, C. Wylie; Wilcoxon, J.A.; Worstell, P.

doi:10.2973/dsdp.proc.11.109.1972

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…2). During DSDP Leg 11, the previous Glomar Challenger cruise to this area, the Eocene outcrop belt was drilled at Site 108 some 8.5 km northwest of Site 605 using an experimental turbocorer (Hollister et al, 1972). By this method, two wash cores were recovered over a 36 m interval and yielded middle Eocene microfossils (Luterbacher, 1972;Wilcoxon, 1972).…”

Section: Introductionmentioning

confidence: 99%

Eocene Calcareous Nannofossils, Deep Sea Drilling Project Site 605, Upper Continental Rise off New Jersey, U.S.A.

Applegate¹,

Wise²

1987

Initial Reports of the Deep Sea Drilling Project

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Deep Sea Drilling Project Site 605 recovered a nearly continuous and thick (366 m) lower to middle Eocene carbonate sequence. The diversity of nannofossils is quite high and coccoliths are generally abundant to very abundant. Preservation is moderate in the upper part of the sequence and poor in the lower part, corresponding to a marked decrease in the biogenic silica content. Unrestricted open marine conditions are indicated by the high pelagic content of the section. The proximity to the continent is suggested by the early representatives of Tribrachiatus in CP9a and the occurrence of braarudosphaerids where preservation is moderate. Strict application of the low latitude zonation of Bukry is hindered somewhat in two instances by (1) the apparent absence of the zonal marker Coccolithus crassus in this section, and (2) the unanticipated overlap of the subzonal markers Chiasmolithus gigas and Reticulofenestra umbilica over 53.1 m of section.

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Section: Introductionmentioning

confidence: 99%

Eocene Calcareous Nannofossils, Deep Sea Drilling Project Site 605, Upper Continental Rise off New Jersey, U.S.A.

Applegate¹,

Wise²

1987

Initial Reports of the Deep Sea Drilling Project

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“…multichannel seismic Lines 25 and 34 affords excellent correlation of the sedimentary sequences here with seismic sequences recorded on the dense grid of seismic lines crossing this part of the New Jersey margin. The site is located just updip of the broad submarine outcrop of middle Eocene biosiliceous carbonate-rich strata that were sampled by DSDP Leg 11 at Site 108 (Hollister, Ewing, et al, 1972). It serves as the stratigraphic link between the COST B-3 well on the upper slope 10 km to the north and Site 605 on the upper rise, 17 km to the southeast.…”

Section: Introductionmentioning

confidence: 99%

Site 612

1987

Initial Reports of the Deep Sea Drilling Project

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GEOLOGIC SETTING AND OBJECTIVES Hole 612Site 612 is on the middle part of the New Jersey continental slope in 1404 m water depth. The surface of the continental slope in this region is characterized by a complex series of submarine canyons and associated smaller channels whose axes trend southeastward downslope. Site 612 is located in one of the smaller channels, which is subsidiary to Carteret Canyon (see Figure and Objectives chapter, this volume). The northwestern edge of a broad (-10 km maximum width) seafloor outcrop belt of middle Eocene strata is approximately 2 km southeast of Site 612. Site 612 is positioned approximately 0.7 km northwest of the intersection of U.S.G.S. multichannel seismic Lines 25 and 34. The COST B.-3 well is 10 km north of Site 612; ASP 14 is 6 km to the west; ASP 15 is 6.4 km to the southwest.Structurally, Site 612 occupies the crest of a gently dipping anticline. The arching of this structure appears to be related to differential compaction and faulting of sedimentary beds deposited in front of and behind a buried Late Jurassic-Early Cretaceous shelf-edge reef . The arched geometry has been accentuated by severe erosion, particularly of middle Eocene strata, that has significantly thinned the sedimentary sequence in the landward direction, toward the COST B-3 well projection (see Figure 5 of Background and Objectives chapter, this volume). The landward dip of strata between the COST B-3 projection and Site 612 persisted until the early Miocene, when the depositional trough beneath the COST B-3 projection was filled with terrigenous deposits. This infilling initiated a seaward dip, which has been maintained to the present.Another apparent consequence of differential compaction along Line 25 is the development of a series of normal faults, some of which display the characteristic downward-increasing throw of growth faults. A prominent system of such normal faults is manifest on Line 25 approximately 2 km southeast of Site 612, at the edge of the middle Eocene outcrop belt (see Figure 5 of Background and Objectives chapter, this volume).Mapping the top of the Cretaceous strata has shown that the post-Cretaceous structural closure beneath Site 612 is only apparent. In fact, the structural closure on the top of the Cretaceous is a few kilometers northwest of the COST B-3 well. Since no hydrocarbon accumulations other than methane gas were encountered in the B-3 well (Scholle et al., 1980), drilling at Site 612 was not considered to be geologically hazardous.The location for Site 612 was selected to provide a reasonably complete Cenozoic and Upper Cretaceous stratigraphic section in a middle continental slope setting that would link the sections drilled at the COST B-3 well and at Site 605. It also provides a western Atlantic counterpart to Site 548 on Goban Spur (upper continental slope of Ireland; Graciansky, and Site 369 off Morocco (Lancelot, Seibold, et al., 1978). The general objectives of Site 612 are the same as those of the other New Jersey margin sites (see Background and Ob...

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“…Resistant middle Eocene carbonates are exposed in a wide outcrop belt along the lower continental slope ( Fig. 7; Robb et al, 1981Robb et al, a,b, 1983Hampson and Robb, 1984), where cores reveal white to light gray, clayey, biogenic oozes and nannofossil limestones containing radiolarians (e.g., DSDP Site 108; Hollister, Ewing, et al, 1972). Lower Eocene strata are characteristically altered by silica diagenesis throughout the region (from the coastal plain to the continental rise), especially in the upper beds.…”

Section: Eocene Stratamentioning

confidence: 99%

Site 108: Continental Slope

Cited by 3 publications

References 1 publication

Eocene Calcareous Nannofossils, Deep Sea Drilling Project Site 605, Upper Continental Rise off New Jersey, U.S.A.

Eocene Calcareous Nannofossils, Deep Sea Drilling Project Site 605, Upper Continental Rise off New Jersey, U.S.A.

Site 612

Background and Objectives of the New Jersey Transect. Continental Slope and Upper Rise

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