Baltimore gabbro complex

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Journal Article
Journal: GSA Bulletin
Published: 01 September 1951
GSA Bulletin (1951) 62 (9): 979–1016.
...NORMAN HERZ Abstract The Baltimore gabbro, made classic by G. H. Williams, is found to conform to modern petrologic theories. Two plagioclases, An 78–83 and An 64–70 distinguish themselves. The mafic minerals, especially orthopyroxene, show evidences of strong fractionation. Alleged primary brown...
Series: GSA Special Papers
Published: 01 January 1989
DOI: 10.1130/SPE231-p1
... The Baltimore mafic complex in the central Appalachian Piedmont consists of tectonically emplaced layered ultramafic, mafic cumulate, and volcanic rocks. The general stratigraphy of the layered rocks is basal dunite and chromitite grading upward through lherzolite and websterite to hypersthene...
Series: GSA Field Guide
Published: 26 February 2020
DOI: 10.1130/2020.0057(02)
EISBN: 9780813756578
... Ultramafic and mafic rocks of the BMC were previously included in such units as the “Gabbro of Baltimore County” ( Knopf and Jonas, 1929 ), “Baltimore Gabbro Complex” ( Herz, 1951 ; Hopson, 1964 ; Cleaves et al., 1968 ), and “Baltimore-State Line Gabbro-Peridotite Complex” ( Southwick, 1969 ). As the name...
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Journal Article
Published: 01 October 1983
Earth Sciences History (1983) 2 (2): 145–155.
... Piedmont, concentrating on stratigraphy and structure. One of his most important contributions was presenting evidence for the tectonic emplacement of the Baltimore Gabbro Complex. Crowley, in his early 40’s, was nearing a synthesis of northern Piedmont history when his career was cut short by his death...
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Journal Article
Journal: Geosphere
Published: 05 February 2021
Geosphere (2021) 17 (2): 561–581.
... of the central and southern Appalachian orogen and its relationship with the northern Appalachian orogen. We present the results of field observations, petrography, bulk-rock geochemistry, and spinel mineral chemistry for ultramafic portions of the Baltimore Mafic Complex, which refers to a series of ultramafic...
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Journal Article
Journal: AAPG Bulletin
Published: 01 September 1979
AAPG Bulletin (1979) 63 (9): 1452–1466.
... Hatteras. A major delta complex, characterized by freshwater diatom assemblages, developed in the Baltimore Canyon Trough off Virginia and Maryland. Pleistocene sand and silt are widespread in the Baltimore Canyon Trough, and they also are dominated by terrigenous clastic constituents. Pleistocene...
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Journal Article
Published: 01 October 2008
Earth Sciences History (2008) 27 (2): 188–219.
... in microscopic petrography. In the fall of 1883, Williams became an Associate on the faculty and began teaching crystallography and mineralogy in the Department of Chemistry in addition to initiating investigations of gabbros and hornblendebearing rocks around Baltimore and the Cortlandt Complex near Peekskill...
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Journal Article
Published: 01 December 1985
Bulletin of the Seismological Society of America (1985) 75 (6): 1699–1711.
... branches with a delay of ≈0.2 sec. The basement granites, rhyolites, and gabbros are very near the surface throughout the study area; both granite and gabbro outcrops are seen. Basement P -wave velocities are therefore relatively high. Representative velocities are 4.7 km/sec at 0.8 km depth, 6.2 at 1.8...
Journal Article
Published: 01 August 1989
Journal of the Geological Society (1989) 146 (4): 575–596.
.... 18 km depth. This suggests that the complex forms part of the root of a now eroded batholith of calc-alkaline affinities, the gabbros corresponding to the transition zone to a basic bottom which is often supposed to underlie many batholiths. Within the orthogneisses are sheets of paragneiss formed...
Journal Article
Published: 01 June 2014
The Canadian Mineralogist (2014) 52 (3): 473–486.
... ), to 490 ± 20 Ma, obtained from Sm-Nd analyses of plagioclase, pyroxene, and whole-rock samples from the Baltimore Mafic Complex (BMC) ( Shaw & Wasserburg 1984 ). The Union ultramafic complex is composed of numerous small bodies that lack chilled margins and are concordant with the regional foliation...
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Journal Article
Published: 26 February 2021
Canadian Journal of Earth Sciences (2021) 58 (10): 1027–1039.
... metamorphosed at amphibolite- to granulite-facies conditions during the Grenvillian Orogeny are preserved in a series of inliers that form parallel western and eastern belts in the eastern United States ( Fig. 1 ). In the central Appalachian Piedmont, inliers composing the eastern belt include the Baltimore...
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Journal Article
Journal: Geology
Published: 01 January 2001
Geology (2001) 29 (1): 11–14.
... are poorly known because of uncertain initial conditions and the complex propagation conditions in geologic targets ( Melosh, 1989 ). The initial deformation of the conglomerates by the shock wave should result in a peak particle velocity immediately behind the shock front. This velocity is estimated...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 2006
GSA Bulletin (2006) 118 (1-2): 39–64.
... and monazite. All but one member of the Wilmington Complex crystallized in the Ordovician between ca. 475 and 485 Ma; these rocks were intruded by a suite of gabbro-to-granite plutonic rocks at 434 ± 5 Ma. Detrital zircons in metavolcanic and metasedimentary units were derived predominantly from 0.9 to 1.4 Ga...
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Journal Article
Published: 01 September 1976
Journal of the Geological Society (1976) 132 (5): 485–508.
... of the tholeiitic series 1962 Publishing House, U.S.S.R. Acad. Science 1 43 Rothstein A. T. V. New light on the Dawros peridotite Geol Mag 1964 101 283 85 Southwick D. L. Structure and petrology of the Baltimore–State Line gabbro-peridotite complex Studies of Appalachian geology...
Journal Article
Published: 01 November 2004
American Mineralogist (2004) 89 (11-12): 1631–1639.
... by Banfield et al. (1995) and Banfield and Bailey (1996) . According to Hanan and Sinha (1989) , the serpentinite formed as an alteration product of dunite and gabbro belonging to the Baltimore mafic complex, which formed in a marginal basin inland from a volcanic arc or as a sub-arc plutonic complex...
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Journal Article
Published: 01 October 1999
Earth Sciences History (1999) 18 (2): 159–179.
... two of Irving’s hand drawn (and hand-colored) thin sections of the Keweenawan gabbros. Bascom applied these same petrographic techniques, to which she was introduced in 1883–84, to the study of similar complex crystalline rocks in Maryland, Delaware, New Jersey, and Pennsylvania over the course of her...
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Journal Article
Published: 01 June 1980
Journal of the Geological Society (1980) 137 (3): 311–320.
.... Polymetamorphism of the Precambrian Baltimore gneiss in southeastern Pennsylvania Am. J. Sci. 1975 275 653 82 Ward R. F. Petrology and metamorphism of the Wilmington complex, Delaware, Pennsylvania, and Maryland Bull. geol. Soc. Am 1959 70 1425 58 Wise D. U. Fisher G. W...
Journal Article
Published: 01 October 1999
Earth Sciences History (1999) 18 (2): 295–320.
.... Although Charles Darwin (1809–1882) in 1844 and Clarence King (1842–1901) in 1878 had suggested that crystal settling might produce diverse magmas, the idea of differentiation emerged in more explicit form during the 1880s within the context of discussions about the nature of magma as a complex silicate...
Journal Article
Journal: AAPG Bulletin
Published: 01 August 1948
AAPG Bulletin (1948) 32 (8): 1493–1595.
... of the ’Martic Overthrust’ and the Glenarm Series in Pennsylvania and Maryland ,” Geol. Soc. America Spec. Paper 35. 207 pp. COHEN , CHARLES J. , 1937 , “ Structure of the Metamorphosed Gabbro Complex at Baltimore, Maryland ,” Rept. Maryland Geol. Survey , Vol. 13 , pp. 215 – 36 . CUSHING...
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Journal Article
Published: 27 May 2022
The Canadian Mineralogist (2022) 60 (3): 417–431.
..., granular, locally oolitic, conglomeratic iron formation, it is highly variable in its stratigraphy, mineralogy, and textures, which are the consequence of sedimentology, diagenesis, metamorphism, structural deformation, and magmatic overprint. Despite its complexity, the regional characteristics...
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