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Volume 18, Number 4

April, 1990

ISSN 0091-7613

EISSN 1943-2682

Magnetostratigraphy, Late Devonian iridium anomaly, and impact hypotheses

Neil F. Hurley; Rob Van der Voo

Abstract

View articletitled, Magnetostratigraphy, Late Devonian iridium anomaly, and impact hypotheses

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Geology April 01, 1990, Vol.18, 291-294. doi:https://doi.org/10.1130/0091-7613(1990)018<0291:MLDIAA>2.3.CO;2

Reading the Moon's volcanic record by ion microprobe analysis of Apollo 14 glass beads

J. J. Papike; C. K. Shearer; K. C. Galbreath

Abstract

View articletitled, Reading the Moon's volcanic record by ion microprobe analysis of Apollo 14 glass beads

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Geology April 01, 1990, Vol.18, 295-298. doi:https://doi.org/10.1130/0091-7613(1990)018<0295:RTMSVR>2.3.CO;2

Rotation of extension direction in the central Kenya Rift

M. R. Strecker; P. M. Blisniuk; G. H. Eisbacher

Abstract

View articletitled, Rotation of extension direction in the central Kenya Rift

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Geology April 01, 1990, Vol.18, 299-302. doi:https://doi.org/10.1130/0091-7613(1990)018<0299:ROEDIT>2.3.CO;2

Sedimentological evidence for a limited separation between Armorica and Gondwana during the Early Ordovician

Ch. Noblet; J. P. Lefort

Abstract

View articletitled, Sedimentological evidence for a limited separation between Armorica and Gondwana during the Early Ordovician

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Geology April 01, 1990, Vol.18, 303-306. doi:https://doi.org/10.1130/0091-7613(1990)018<0303:SEFALS>2.3.CO;2

Apparent isobaric cooling paths from granulites: Two counterexamples from British Columbia and New Hampshire

Jane Selverstone; C. Page Chamberlain

Abstract

View articletitled, Apparent isobaric cooling paths from granulites: Two counterexamples from British Columbia and New Hampshire

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Geology April 01, 1990, Vol.18, 307-310. doi:https://doi.org/10.1130/0091-7613(1990)018<0307:AICPFG>2.3.CO;2

Late Tertiary floral assemblage from upland gravel deposits of the southern Maryland Coastal Plain

Lucy McCartan; Bruce H. Tiffney; Jack A. Wolfe; Thomas A. Ager; Scott L. Wing; Leslie A. Sirkin; Lauck W. Ward; James Brooks

Abstract

View articletitled, Late Tertiary floral assemblage from upland gravel deposits of the southern Maryland Coastal Plain

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Geology April 01, 1990, Vol.18, 311-314. doi:https://doi.org/10.1130/0091-7613(1990)018<0311:LTFAFU>2.3.CO;2

Br-Cl-Na systematics in Illinois basin fluids: Constraints on fluid origin and evolution

Lynn M. Walter; Alan M. Stueber; Ted J. Huston

Abstract

View articletitled, Br-Cl-Na systematics in Illinois basin fluids: Constraints on fluid origin and evolution

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Geology April 01, 1990, Vol.18, 315-318. doi:https://doi.org/10.1130/0091-7613(1990)018<0315:BCNSII>2.3.CO;2

Alpine Jurassic ophiolites resemble the modern central Atlantic basement

Yves Lagabrielle; Mathilde Cannat

Abstract

View articletitled, Alpine Jurassic ophiolites resemble the modern central Atlantic basement

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Geology April 01, 1990, Vol.18, 319-322. doi:https://doi.org/10.1130/0091-7613(1990)018<0319:AJORTM>2.3.CO;2

Two-stage rifting of Pangea by two different mechanisms

Andrew Hynes

Abstract

View articletitled, Two-stage rifting of Pangea by two different mechanisms

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Geology April 01, 1990, Vol.18, 323-326. doi:https://doi.org/10.1130/0091-7613(1990)018<0323:TSROPB>2.3.CO;2

Generating melt during lithospheric extension: Pure shear vs. simple shear

Dave Latin; Nicky White

Abstract

View articletitled, Generating melt during lithospheric extension: Pure shear vs. simple shear

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Geology April 01, 1990, Vol.18, 327-331. doi:https://doi.org/10.1130/0091-7613(1990)018<0327:GMDLEP>2.3.CO;2

U.S. west coast revisited: An aeromagnetic perspective

Peter R. Johnson; Isidore Zietz; Kevin R. Bond

Abstract

View articletitled, U.S. west coast revisited: An aeromagnetic perspective

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Geology April 01, 1990, Vol.18, 332-335. doi:https://doi.org/10.1130/0091-7613(1990)018<0332:USWCRA>2.3.CO;2

Cathodoluminescence microscopy of myrmekite

R. Forrest Hopson; Karl Rarnseyer

Abstract

View articletitled, Cathodoluminescence microscopy of myrmekite

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Geology April 01, 1990, Vol.18, 336-339. doi:https://doi.org/10.1130/0091-7613(1990)018<0336:CMOM>2.3.CO;2

Precambrian time units and nomenclature—The geon concept

H. J. Hofmann

Abstract

View articletitled, Precambrian time units and nomenclature—The geon concept

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Geology April 01, 1990, Vol.18, 340-341. doi:https://doi.org/10.1130/0091-7613(1990)018<0340:PTUANT>2.3.CO;2

Channel trenching and climatic change in the southern U.S. Great Plains

Stephen A. Hall

Abstract

View articletitled, Channel trenching and climatic change in the southern U.S. Great Plains

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Geology April 01, 1990, Vol.18, 342-345. doi:https://doi.org/10.1130/0091-7613(1990)018<0342:CTACCI>2.3.CO;2

Discrimination of ophiolitic from nonophiolitic ultramafic-mafic allochthons in orogenic belts by the Al/Ti ratio in clinopyroxene

Robert R. Loucks

Abstract

View articletitled, Discrimination of ophiolitic from nonophiolitic ultramafic-mafic allochthons in orogenic belts by the Al/Ti ratio in clinopyroxene

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Geology April 01, 1990, Vol.18, 346-349. doi:https://doi.org/10.1130/0091-7613(1990)018<0346:DOOFNU>2.3.CO;2

Use of reaction space in depicting polymetamorphic histories

Jill S. Schneiderman

Abstract

View articletitled, Use of reaction space in depicting polymetamorphic histories

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Geology April 01, 1990, Vol.18, 350-353. doi:https://doi.org/10.1130/0091-7613(1990)018<0350:UORSID>2.3.CO;2

Episodic rapid uplift in the Himalaya revealed by ⁴⁰Ar/³⁹Ar analysis of detrital K-feldspar and muscovite, Bengal fan

Peter Copeland; T. Mark Harrison

Abstract

View articletitled, Episodic rapid uplift in the Himalaya revealed by <sup>40</sup>Ar/<sup>39</sup>Ar analysis of detrital K-feldspar and muscovite, Bengal fan

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Geology April 01, 1990, Vol.18, 354-357. doi:https://doi.org/10.1130/0091-7613(1990)018<0354:ERUITH>2.3.CO;2

Angles of repose that exceed modern angles

C. John Mann; Sherman P. Kanagy, II

Abstract

View articletitled, Angles of repose that exceed modern angles

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Geology April 01, 1990, Vol.18, 358-361. doi:https://doi.org/10.1130/0091-7613(1990)018<0358:AORTEM>2.3.CO;2

Paleosols and the Cretaceous/Tertiary transition in the Big Bend region of Texas

Thomas M. Lehman

Abstract

View articletitled, Paleosols and the Cretaceous/Tertiary transition in the Big Bend region of Texas

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Geology April 01, 1990, Vol.18, 362-364. doi:https://doi.org/10.1130/0091-7613(1990)018<0362:PATCTT>2.3.CO;2

Yukon-Tanana terrane: A partial acquittal

Vicki L. Hansen

Abstract

View articletitled, Yukon-Tanana terrane: A partial acquittal

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Geology April 01, 1990, Vol.18, 365-369. doi:https://doi.org/10.1130/0091-7613(1990)018<0365:YTTAPA>2.3.CO;2

New microtextural criterion for differentiation of compaction and early cementation in fine-grained limestones

Zakaria Lasemi; Philip A. Sandberg; Mark R. Boardman

Abstract

View articletitled, New microtextural criterion for differentiation of compaction and early cementation in fine-grained limestones

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Geology April 01, 1990, Vol.18, 370-373. doi:https://doi.org/10.1130/0091-7613(1990)018<0370:NMCFDO>2.3.CO;2

Shear zones in the upper mantle—Relation between geochemical enrichment and deformation in mantle peridotites

H. Downes

Abstract

View articletitled, Shear zones in the upper mantle—Relation between geochemical enrichment and deformation in mantle peridotites

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Geology April 01, 1990, Vol.18, 374-377. doi:https://doi.org/10.1130/0091-7613(1990)018<0374:SZITUM>2.3.CO;2

Comment and Reply on "Major Proterozoic basement features of the eastern midcontinent of North America revealed by recent COCORP profiling"

W. John Nelson; Thomas Pratt; Ernest Hauser; K. Douglas Nelson

Abstract

View articletitled, Comment and Reply on "Major Proterozoic basement features of the eastern midcontinent of North America revealed by recent COCORP profiling"

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Geology April 01, 1990, Vol.18, 378-379. doi:https://doi.org/10.1130/0091-7613(1990)018<0378:CAROMP>2.3.CO;2

Comment and Reply on "Late Precambrian crustal extension preserved in Fries fault zone mylonites, southern Appalachians"

James O. Eckert, Jr.; Carol Simpson; Theresa Kalaghan

Abstract

View articletitled, Comment and Reply on "Late Precambrian crustal extension preserved in Fries fault zone mylonites, southern Appalachians"

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Geology April 01, 1990, Vol.18, 379-380. doi:https://doi.org/10.1130/0091-7613(1990)018<0379:CAROLP>2.3.CO;2

Comment and Reply on "Neogene extensional collapse in the western Mediterranean (Betic-Rif Alpine orogenic belt): Implications for the genesis of the Gibraltar Arc and magmatic activity"

Dominique Frizon de Lamotte; Jean-Claude Guezou; Jean Andrieux; Marie-Anne Albertini; Michel Coulon; André Poisson; Miguel Doblas; Roberto Oyarzun

Abstract

View articletitled, Comment and Reply on "Neogene extensional collapse in the western Mediterranean (Betic-Rif Alpine orogenic belt): Implications for the genesis of the Gibraltar Arc and magmatic activity"

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Geology April 01, 1990, Vol.18, 381-382. doi:https://doi.org/10.1130/0091-7613(1990)018<0381:CARONE>2.3.CO;2

Comment and Reply on "Archean protoliths within Early Proterozoic granulitic crust of the west European Hercynian belt: Possible relics of the west African craton"

Abstract

View articletitled, Comment and Reply on "Archean protoliths within Early Proterozoic granulitic crust of the west European Hercynian belt: Possible relics of the west African craton"

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Geology April 01, 1990, Vol.18, 382-384. doi:https://doi.org/10.1130/0091-7613(1990)018<0382:CAROAP>2.3.CO;2

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Marine snowstorm during the Permian−Triassic mass extinction

Metasomatized mantle sources for orogenic gold deposits hosted in high-grade metamorphic rocks: Evidence from Hg isotopes

Massive rare earth element storage in sub-continental lithospheric mantle initiated by diapirism, not by melting

Intrusion tip velocity controls the emplacement mechanism of sheet intrusions

Pleistocene Colorado River terraces in the canyonlands region (Utah, USA) record unsteady, transient incision and growth of the Cataract Canyon knickzone by salt tectonics

Magnetostratigraphy, Late Devonian iridium anomaly, and impact hypotheses

Reading the Moon's volcanic record by ion microprobe analysis of Apollo 14 glass beads

Rotation of extension direction in the central Kenya Rift

Sedimentological evidence for a limited separation between Armorica and Gondwana during the Early Ordovician

Apparent isobaric cooling paths from granulites: Two counterexamples from British Columbia and New Hampshire

Late Tertiary floral assemblage from upland gravel deposits of the southern Maryland Coastal Plain

Br-Cl-Na systematics in Illinois basin fluids: Constraints on fluid origin and evolution

Alpine Jurassic ophiolites resemble the modern central Atlantic basement

Two-stage rifting of Pangea by two different mechanisms

Generating melt during lithospheric extension: Pure shear vs. simple shear

U.S. west coast revisited: An aeromagnetic perspective

Cathodoluminescence microscopy of myrmekite

Precambrian time units and nomenclature—The geon concept

Channel trenching and climatic change in the southern U.S. Great Plains

Discrimination of ophiolitic from nonophiolitic ultramafic-mafic allochthons in orogenic belts by the Al/Ti ratio in clinopyroxene

Use of reaction space in depicting polymetamorphic histories

Episodic rapid uplift in the Himalaya revealed by ⁴⁰Ar/³⁹Ar analysis of detrital K-feldspar and muscovite, Bengal fan

Angles of repose that exceed modern angles

Paleosols and the Cretaceous/Tertiary transition in the Big Bend region of Texas

Yukon-Tanana terrane: A partial acquittal

New microtextural criterion for differentiation of compaction and early cementation in fine-grained limestones

Shear zones in the upper mantle—Relation between geochemical enrichment and deformation in mantle peridotites

Comment and Reply on "Major Proterozoic basement features of the eastern midcontinent of North America revealed by recent COCORP profiling"

Comment and Reply on "Late Precambrian crustal extension preserved in Fries fault zone mylonites, southern Appalachians"

Comment and Reply on "Neogene extensional collapse in the western Mediterranean (Betic-Rif Alpine orogenic belt): Implications for the genesis of the Gibraltar Arc and magmatic activity"

Comment and Reply on "Archean protoliths within Early Proterozoic granulitic crust of the west European Hercynian belt: Possible relics of the west African craton"

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