Petrology and tectonic affinity of the Baltimore mafic complex, Maryland

Hanan, B. B.; Sinha, A. K.

doi:10.1130/spe231-p1

Cited by 27 publications

(57 citation statements)

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“…The unit was interpreted to have been generated within a continental margin arc by Hanan and Sinha (1989) and Drake (in press b). The Mount Washington is covered almost entirely by Coastal Plain deposits in this area, but amphibolite can be seen along the Patuxent River at Laurel and near the north border of the map, and serpentinized olivine gabbro crops out along Sligo Creek.…”

Section: Baltimore Thrust Sheetmentioning

confidence: 99%

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Geologic map of the Piedmont in the Beltsville, Laurel, and Washington East quadrangles, Montgomery, Prince Georges, Howard, and Anne Arundel Counties, Maryland and the District of Columbia

Drake¹

1998

Open-File Report

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Section: Baltimore Thrust Sheetmentioning

confidence: 99%

“…The Baltimore thrust sheet does not appear on the west limb of the culmination. Rocks of the Baltimore thrust sheet were generated within an ensialic basin (Hanan and Sinha, 1989;Drake, in press b).…”

Section: Rock Creek Shear Zonementioning

confidence: 99%

Geologic map of the Piedmont in the Beltsville, Laurel, and Washington East quadrangles, Montgomery, Prince Georges, Howard, and Anne Arundel Counties, Maryland and the District of Columbia

Drake¹

1998

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“…For example, huge amounts of serpentinites in the Appalachians could be found almost everywhere and huge amounts of dunites are known: massive chromite-bearing dunite in the Nadeau Ophiolitic Mélange (Quebec Appalachians, Canada) [253]; in the Baltimore mafic complex (Maryland, USA) [254]; alternating layers of dunite and chromite-rich dunite in the Quebec Appalachians [255]; serpentinized dunites from the Webster-Addie ultramafic body (about 10 km long and 5 km wide) (North Carolina, USA) [256]; Blue Ridge dunites of North Carolina [257]; dunites of the Bay of Islands Ophiolite (Canada) [258]; dunites of the Sept-Îles Anorthosite Complex (Quebec, Canada) [259]; dunites of the Thetford Mines Ophiolite Complex (Canada) [260]; chromitites of the Middle Arm Brook are enveloped by dunites (Advocate ophiolite complex, Baie Verte Peninsula, Newfoundland, Canada) [137]. These data noticeably testify that huge amounts of dunites were directly involved in obduction processes in the Appalachians region.…”

Section: Relationships Of Pges and Pgms Ore Deposits Formation With Pmentioning

confidence: 99%

Concentration of Platinum Group Elements during the Early Earth Evolution: A Review*

Pilchin¹,

Eppelbaum²

2017

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Numerous unique geological processes [1] took place during the early Earth evolution; several of them, especially those occurring in the Hadean-Early Archean and later, are reflected in the modern geological (geophysical, geochemical, etc.) pattern. One such significant enigmatic feature is the preservation of extremely dense and heavy platinum group elements (PGEs): Pt, Pd, Rh, Ru, Ir, Os. Concentration of PGEs during this period could have taken place in two ways: 1) presence of particular matter capable of preserving PGEs near the earth's surface, 2) transportation of PGEs by magma flows from deep lithospheric (asthenospheric) layers (slabs) to the subsurface. Clearly, much of the dense and heavy PGEs did not sink through to the Earth's mantle (core) at the time of the magma-ocean, and occur near Earth's surface in abundances for formation of ore deposits with PGE concentrations found to be 2 -3 orders of magnitude greater than those in their host media. Their enrichments are associated in numerous cases with such enigmatic phenomena as formation of anorthosites and anorthosite-bearing layered magmatic intrusions. PGE deposits and mineralization zones are also found in associations with chromitites, dunites and serpentinites. In this review, problems related to the initial concentration and preservation of PGEs, their association with anorthosites, and formation of layered intrusions are discussed in detail. The main aim of this article is analysis of the requirements-initial concentration and preservation of PGE and PGM (Platinum Group Minerals) during the early Earth evolution, as well as examination of the distribution behavior of some PGEs in different ore deposits and meteorites. It is supposed that meteoritic bombardment of Earth has played a significant role in formation of PGEs deposits. Some conclusions made in this article may be useful for developing and enhancing strategies of prospecting for PGEs deposits.

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“…The Aberdeen block of the Bel Air-Rising Sun terrane could have been thrust onto the James Run Formation of the Chopawamsic terrane during either the Penobscottian or Taconian orogeny. REFERENCES-Crowley (1976);Hanan (1980); Higgins and Conant (1990); Horton and Drake (1986); others (1989a, 1989b); Morgan (1977); Shaw and Wasserburg (1984); Sinha and Hanan (1987); Southwick (1970) …”

Section: Deformational and Metamorphic Events-mentioning

confidence: 99%

“…EVIDENCE FOR TERRANE IDENTITY AND TIME OF AMALGAMATION-The Baltimore Complex has been variously interpreted as a partial ophiolite (Crowley, 1976;Morgan, 1977), the plutonic base for an island arc (Hanan, 1980;Sinha and Hanan, 1987), and(or) a stratiform intrusive complex (Southwick, 1970).…”

Section: Deformational and Metamorphic Events-mentioning

confidence: 99%

Terranes and overlap sequences in the Central and Southern Appalachians, an expanded explanation for part of the Circum-Atlantic terrane map

Horton¹,

Drake²,

Rankin³

1994

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Petrology and tectonic affinity of the Baltimore mafic complex, Maryland

Cited by 27 publications

References 0 publications

Geologic map of the Piedmont in the Beltsville, Laurel, and Washington East quadrangles, Montgomery, Prince Georges, Howard, and Anne Arundel Counties, Maryland and the District of Columbia

Geologic map of the Piedmont in the Beltsville, Laurel, and Washington East quadrangles, Montgomery, Prince Georges, Howard, and Anne Arundel Counties, Maryland and the District of Columbia

Concentration of Platinum Group Elements during the Early Earth Evolution: A Review*

Terranes and overlap sequences in the Central and Southern Appalachians, an expanded explanation for part of the Circum-Atlantic terrane map

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