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GEOREF RECORD

Igneous rocks of the Flemington fault zone, central Newark Basin, New Jersey; geochemistry, structure, and stratigraphy

Hugh F. Houghton, Gregory C. Herman and Richard A. Volkert
Igneous rocks of the Flemington fault zone, central Newark Basin, New Jersey; geochemistry, structure, and stratigraphy (in Eastern North American Mesozoic magmatism, John H. Puffer (editor) and Paul C. Ragland (editor))
Special Paper - Geological Society of America (1992) 268: 219-232

Abstract

The Flemington fault zone in the central Newark basin contains a complex system of faults consisting of both braided and en echelon segments with folds trending perpendicular and parallel to the major faults. Six basalt flows centered at three loci, and five diabase intrusions at four loci occur within a 35-km (22 mi) interval of the hanging-wall region of the fault zone. Lower basalt flows and chilled diabases are classified as low-TiO (sub 2) quartz-tholeiites; upper basalt flows are classified as high-iron quartz tholeiites. Chill-margin samples of diabase and the lower stratigraphic group of basalts match the composition of Orange Mountain Basalt. Two stratigraphically higher basalts correlate with Preakness Basalt. Differentiation models indicate that granophyric diabase can be produced from chill-margin composition by removal of pyroxene, plagioclase, and olivine, and addition of Fe/Ti-oxide, orthoclase, and quartz. Structure contouring indicates that Cushetunk Mountain and adjacent diabase stocks intrude the Passaic Formation at a low stratigraphic level, approximately the same level as the Lambertville sill. Diabase intruded into the uppermost part of the Passaic Formation at Oldwick is nearly identical to other fine-grained diabases, indicating that chemical fractionation is not related to stratigraphic height of intrusion.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 268
Title: Igneous rocks of the Flemington fault zone, central Newark Basin, New Jersey; geochemistry, structure, and stratigraphy
Title: Eastern North American Mesozoic magmatism
Author(s): Houghton, Hugh F.Herman, Gregory C.Volkert, Richard A.
Author(s): Puffer, John H.editor
Author(s): Ragland, Paul C.editor
Affiliation: New Jersey Geological Survey, Trenton, NJ, United States
Affiliation: Rutgers University, Geology Department, Newark, NJ, United States
Pages: 219-232
Published: 1992
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 0813722683
References: 21
Accession Number: 1993-006083
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N38°55'00" - N41°21'00", W75°34'60" - W73°52'60"
Secondary Affiliation: Florida State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1993
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