Fluid flow and thermal histories for Cambrian-Ordovician platform deposits, New York: Evidence from fluid inclusion studies

C O'Reilly, J Parnell

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Anthraxolite, a high-rank solid petroleum residue, occurs in vugs, fractures, and disseminations throughout the Upper Cambrian and Lower Ordovician dolomite-limestones of the Mohawk Valley, upper New York State. Anthraxolite reflectance values (2.55%-3.35%) confirm other thermal maturity parameter values that the region has experienced paleotemperatures of similar to 200 degrees C. Euhedral to subhedral, transparent crystals of quartz precipitated in association with the anthraxolite.

Paragenetic relationships and fluid inclusion studies allow deduction of a succession of fluid types: (1) a cool aqueous fluid that deposited quartz cement; (2) a warm brine that deposited calcite-sulfide veins; (3) a mixed aqueous-petroleum fluid from which the quartz crystals were precipitated, and (4) later aqueous and methane-rich fluids in crosscutting planes, The first two stages (phase I) represent fluids that predate hydrocarbon generation and migration, The third and fourth stages (phrase II) indicate addition of hydrocarbon fluids to basinal brines.

The lack of hydrocarbons in the warm brines at oil window temperatures (phase I), and the presence of oil in later fluids that exceeded oil window temperatures (phase II) suggest transient heating due to hot fluid flow rather than prolonged heating due to burial. This is consistent with models of regional heating and fluid movement due to orogenic activity, probably the Alleghenian orogeny, The traces of sulfide in the Mohawk Valley may be a weak expression of a regional fluid migration event that caused widespread base metal mineralization in the Cambnian-Ordovician rocks of the Appalachians.

Original languageEnglish
Pages (from-to)1884-1896
Number of pages13
JournalGeological Society of America Bulletin
Volume111
Publication statusPublished - 1999

Keywords

  • NORTHERN APPALACHIAN BASIN
  • FISSION-TRACK ANALYSIS
  • DIAGENETIC MAGNETITE
  • PLATE-TECTONICS
  • TEMPERATURES
  • PETROLEUM
  • REMAGNETIZATION
  • PALEOMAGNETISM
  • METAMORPHISM
  • HYDROCARBON

Cite this

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title = "Fluid flow and thermal histories for Cambrian-Ordovician platform deposits, New York: Evidence from fluid inclusion studies",
abstract = "Anthraxolite, a high-rank solid petroleum residue, occurs in vugs, fractures, and disseminations throughout the Upper Cambrian and Lower Ordovician dolomite-limestones of the Mohawk Valley, upper New York State. Anthraxolite reflectance values (2.55{\%}-3.35{\%}) confirm other thermal maturity parameter values that the region has experienced paleotemperatures of similar to 200 degrees C. Euhedral to subhedral, transparent crystals of quartz precipitated in association with the anthraxolite.Paragenetic relationships and fluid inclusion studies allow deduction of a succession of fluid types: (1) a cool aqueous fluid that deposited quartz cement; (2) a warm brine that deposited calcite-sulfide veins; (3) a mixed aqueous-petroleum fluid from which the quartz crystals were precipitated, and (4) later aqueous and methane-rich fluids in crosscutting planes, The first two stages (phase I) represent fluids that predate hydrocarbon generation and migration, The third and fourth stages (phrase II) indicate addition of hydrocarbon fluids to basinal brines.The lack of hydrocarbons in the warm brines at oil window temperatures (phase I), and the presence of oil in later fluids that exceeded oil window temperatures (phase II) suggest transient heating due to hot fluid flow rather than prolonged heating due to burial. This is consistent with models of regional heating and fluid movement due to orogenic activity, probably the Alleghenian orogeny, The traces of sulfide in the Mohawk Valley may be a weak expression of a regional fluid migration event that caused widespread base metal mineralization in the Cambnian-Ordovician rocks of the Appalachians.",
keywords = "NORTHERN APPALACHIAN BASIN, FISSION-TRACK ANALYSIS, DIAGENETIC MAGNETITE, PLATE-TECTONICS, TEMPERATURES, PETROLEUM, REMAGNETIZATION, PALEOMAGNETISM, METAMORPHISM, HYDROCARBON",
author = "C O'Reilly and J Parnell",
year = "1999",
language = "English",
volume = "111",
pages = "1884--1896",
journal = "Geological Society of America Bulletin",
issn = "0016-7606",
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TY - JOUR

T1 - Fluid flow and thermal histories for Cambrian-Ordovician platform deposits, New York: Evidence from fluid inclusion studies

AU - O'Reilly, C

AU - Parnell, J

PY - 1999

Y1 - 1999

N2 - Anthraxolite, a high-rank solid petroleum residue, occurs in vugs, fractures, and disseminations throughout the Upper Cambrian and Lower Ordovician dolomite-limestones of the Mohawk Valley, upper New York State. Anthraxolite reflectance values (2.55%-3.35%) confirm other thermal maturity parameter values that the region has experienced paleotemperatures of similar to 200 degrees C. Euhedral to subhedral, transparent crystals of quartz precipitated in association with the anthraxolite.Paragenetic relationships and fluid inclusion studies allow deduction of a succession of fluid types: (1) a cool aqueous fluid that deposited quartz cement; (2) a warm brine that deposited calcite-sulfide veins; (3) a mixed aqueous-petroleum fluid from which the quartz crystals were precipitated, and (4) later aqueous and methane-rich fluids in crosscutting planes, The first two stages (phase I) represent fluids that predate hydrocarbon generation and migration, The third and fourth stages (phrase II) indicate addition of hydrocarbon fluids to basinal brines.The lack of hydrocarbons in the warm brines at oil window temperatures (phase I), and the presence of oil in later fluids that exceeded oil window temperatures (phase II) suggest transient heating due to hot fluid flow rather than prolonged heating due to burial. This is consistent with models of regional heating and fluid movement due to orogenic activity, probably the Alleghenian orogeny, The traces of sulfide in the Mohawk Valley may be a weak expression of a regional fluid migration event that caused widespread base metal mineralization in the Cambnian-Ordovician rocks of the Appalachians.

AB - Anthraxolite, a high-rank solid petroleum residue, occurs in vugs, fractures, and disseminations throughout the Upper Cambrian and Lower Ordovician dolomite-limestones of the Mohawk Valley, upper New York State. Anthraxolite reflectance values (2.55%-3.35%) confirm other thermal maturity parameter values that the region has experienced paleotemperatures of similar to 200 degrees C. Euhedral to subhedral, transparent crystals of quartz precipitated in association with the anthraxolite.Paragenetic relationships and fluid inclusion studies allow deduction of a succession of fluid types: (1) a cool aqueous fluid that deposited quartz cement; (2) a warm brine that deposited calcite-sulfide veins; (3) a mixed aqueous-petroleum fluid from which the quartz crystals were precipitated, and (4) later aqueous and methane-rich fluids in crosscutting planes, The first two stages (phase I) represent fluids that predate hydrocarbon generation and migration, The third and fourth stages (phrase II) indicate addition of hydrocarbon fluids to basinal brines.The lack of hydrocarbons in the warm brines at oil window temperatures (phase I), and the presence of oil in later fluids that exceeded oil window temperatures (phase II) suggest transient heating due to hot fluid flow rather than prolonged heating due to burial. This is consistent with models of regional heating and fluid movement due to orogenic activity, probably the Alleghenian orogeny, The traces of sulfide in the Mohawk Valley may be a weak expression of a regional fluid migration event that caused widespread base metal mineralization in the Cambnian-Ordovician rocks of the Appalachians.

KW - NORTHERN APPALACHIAN BASIN

KW - FISSION-TRACK ANALYSIS

KW - DIAGENETIC MAGNETITE

KW - PLATE-TECTONICS

KW - TEMPERATURES

KW - PETROLEUM

KW - REMAGNETIZATION

KW - PALEOMAGNETISM

KW - METAMORPHISM

KW - HYDROCARBON

M3 - Article

VL - 111

SP - 1884

EP - 1896

JO - Geological Society of America Bulletin

JF - Geological Society of America Bulletin

SN - 0016-7606

ER -