Igneous petrogenesis of magnesian metavolcanic rocks from the central Klamath Mountains, northern California

W. G. Ernst, B. R. Hacker, Mark D Barton, G. Sen

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Mafic meta-igneous supracrustal rocks in the east-central part of the western Triassic and Paleozoic belt are interlayered with and appear to predominantly overlie fine-grained clastic and cherty metasedimentary strata. This complex constitutes a lithostratigraphic terrane exposed in the vicinity of Sawyers Bar, California. Element proportions suggest that the dark, Ti + Fe* + P-rich basaltic lavas may have been extruded in an oceanic intraplate setting. Interstratification with distal turbiditic strata indicates concurrent submarine volcanism and deep-sea sedimentary deposition. The main mass of the stratigraphically higher extrusive sequence is a light-colored, massive tholeiite series, poorer in Ti + Fe* + P + LREE's. Hypabyssal rocks belong exclusively to this second igneous suite. Compositions of the pale-colored, overlying basaltic/diabasic mass of the Yellow Dog greenstone section are consistent with eruption in an immature magmatic arc. Yellow Dog igneous activity was extinguished during mid-Jurassic suturing of the oceanward Sawyers Bar terrane against and beneath the pre-existing landward Stuart Fork blueschist complex of Late Triassic metamorphic age. -from Authors

Original languageEnglish (US)
Pages (from-to)56-72
Number of pages17
JournalBulletin of the Geological Society of America
Volume103
Issue number1
DOIs
StatePublished - 1991
Externally publishedYes

Fingerprint

metavolcanic rock
petrogenesis
terrane
Triassic
hypabyssal rock
supracrustal rock
blueschist
mountain
tholeiite
greenstone
igneous rock
deep sea
volcanism
volcanic eruption
Paleozoic
Jurassic
dog

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Igneous petrogenesis of magnesian metavolcanic rocks from the central Klamath Mountains, northern California. / Ernst, W. G.; Hacker, B. R.; Barton, Mark D; Sen, G.

In: Bulletin of the Geological Society of America, Vol. 103, No. 1, 1991, p. 56-72.

Research output: Contribution to journalArticle

@article{2d402fb2d9634c099f76dcf3b0c00925,
title = "Igneous petrogenesis of magnesian metavolcanic rocks from the central Klamath Mountains, northern California",
abstract = "Mafic meta-igneous supracrustal rocks in the east-central part of the western Triassic and Paleozoic belt are interlayered with and appear to predominantly overlie fine-grained clastic and cherty metasedimentary strata. This complex constitutes a lithostratigraphic terrane exposed in the vicinity of Sawyers Bar, California. Element proportions suggest that the dark, Ti + Fe* + P-rich basaltic lavas may have been extruded in an oceanic intraplate setting. Interstratification with distal turbiditic strata indicates concurrent submarine volcanism and deep-sea sedimentary deposition. The main mass of the stratigraphically higher extrusive sequence is a light-colored, massive tholeiite series, poorer in Ti + Fe* + P + LREE's. Hypabyssal rocks belong exclusively to this second igneous suite. Compositions of the pale-colored, overlying basaltic/diabasic mass of the Yellow Dog greenstone section are consistent with eruption in an immature magmatic arc. Yellow Dog igneous activity was extinguished during mid-Jurassic suturing of the oceanward Sawyers Bar terrane against and beneath the pre-existing landward Stuart Fork blueschist complex of Late Triassic metamorphic age. -from Authors",
author = "Ernst, {W. G.} and Hacker, {B. R.} and Barton, {Mark D} and G. Sen",
year = "1991",
doi = "10.1130/0016-7606(1991)103<0056:IPOMMR>2.3.CO;2",
language = "English (US)",
volume = "103",
pages = "56--72",
journal = "Geological Society of America Bulletin",
issn = "0016-7606",
publisher = "Geological Society of America",
number = "1",

}

TY - JOUR

T1 - Igneous petrogenesis of magnesian metavolcanic rocks from the central Klamath Mountains, northern California

AU - Ernst, W. G.

AU - Hacker, B. R.

AU - Barton, Mark D

AU - Sen, G.

PY - 1991

Y1 - 1991

N2 - Mafic meta-igneous supracrustal rocks in the east-central part of the western Triassic and Paleozoic belt are interlayered with and appear to predominantly overlie fine-grained clastic and cherty metasedimentary strata. This complex constitutes a lithostratigraphic terrane exposed in the vicinity of Sawyers Bar, California. Element proportions suggest that the dark, Ti + Fe* + P-rich basaltic lavas may have been extruded in an oceanic intraplate setting. Interstratification with distal turbiditic strata indicates concurrent submarine volcanism and deep-sea sedimentary deposition. The main mass of the stratigraphically higher extrusive sequence is a light-colored, massive tholeiite series, poorer in Ti + Fe* + P + LREE's. Hypabyssal rocks belong exclusively to this second igneous suite. Compositions of the pale-colored, overlying basaltic/diabasic mass of the Yellow Dog greenstone section are consistent with eruption in an immature magmatic arc. Yellow Dog igneous activity was extinguished during mid-Jurassic suturing of the oceanward Sawyers Bar terrane against and beneath the pre-existing landward Stuart Fork blueschist complex of Late Triassic metamorphic age. -from Authors

AB - Mafic meta-igneous supracrustal rocks in the east-central part of the western Triassic and Paleozoic belt are interlayered with and appear to predominantly overlie fine-grained clastic and cherty metasedimentary strata. This complex constitutes a lithostratigraphic terrane exposed in the vicinity of Sawyers Bar, California. Element proportions suggest that the dark, Ti + Fe* + P-rich basaltic lavas may have been extruded in an oceanic intraplate setting. Interstratification with distal turbiditic strata indicates concurrent submarine volcanism and deep-sea sedimentary deposition. The main mass of the stratigraphically higher extrusive sequence is a light-colored, massive tholeiite series, poorer in Ti + Fe* + P + LREE's. Hypabyssal rocks belong exclusively to this second igneous suite. Compositions of the pale-colored, overlying basaltic/diabasic mass of the Yellow Dog greenstone section are consistent with eruption in an immature magmatic arc. Yellow Dog igneous activity was extinguished during mid-Jurassic suturing of the oceanward Sawyers Bar terrane against and beneath the pre-existing landward Stuart Fork blueschist complex of Late Triassic metamorphic age. -from Authors

UR - http://www.scopus.com/inward/record.url?scp=84879890104&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84879890104&partnerID=8YFLogxK

U2 - 10.1130/0016-7606(1991)103<0056:IPOMMR>2.3.CO;2

DO - 10.1130/0016-7606(1991)103<0056:IPOMMR>2.3.CO;2

M3 - Article

AN - SCOPUS:84879890104

VL - 103

SP - 56

EP - 72

JO - Geological Society of America Bulletin

JF - Geological Society of America Bulletin

SN - 0016-7606

IS - 1

ER -