Cretaceous ammonites from the lower part of the Matanuska Formation, southern Alaska

Jones, David L.; Grantz, Arthur

doi:10.3133/pp547

Cited by 20 publications

(26 citation statements)

References 8 publications

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“…The privately owned borrow pit is situated in the Talkeetna Mountains in south-central Alaska near the Glenn Highway at about lat 61°52'N and long 147°21'W Jones, 1963;Jones and Grantz, 1967).…”

Section: Location and Geologic Settingmentioning

confidence: 99%

“…The Lizzie quarry lies in the Matanuska Formation on the southeast limb of the nose in the displaced part of the anticline (Grantz, 1961a, b). According to Jones and Grantz (1967) and Jones (1963), the Matanuska Formation sediments were derived from highlands to the north and deposited in a deep, subsiding, narrow trough. Their texture and mineralogy suggest deposition on a narrow shelf a few miles south of a shoreline to the north.…”

Section: Location and Geologic Settingmentioning

confidence: 99%

“…Both the lithology and the invertebrates of the bonebearing unit strongly suggest that the quarry section belongs to the lower part of C-1, an informal stratigraphic unit of Turonian age in the lower half of the Matanuska Formation as defined by Jones and Grantz (1967), and Member 4 (Turonian), as defined by Jones (1963) (fig. 3).…”

Section: Agementioning

confidence: 99%

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Short notes on Alaska geology 1997

1998

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Section: Location and Geologic Settingmentioning

confidence: 99%

Section: Location and Geologic Settingmentioning

confidence: 99%

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Short notes on Alaska geology 1997

1998

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“…6), are recognized in the Matanuska Valley (Jones and Grantz, 1967) and Wrangell Mountains (Jones, 1973). Minor unconformities are found in the sandstone and shale sequence, but this general depositional pattern continues in the Matanuska Valley into Late Cretaceous time (Jones and Grantz, 1967).…”

Section: Matanuska Terranementioning

confidence: 99%

“…Upper Cretaceous: Upper Cretaceous rocks are assigned to the upper part of the Matanuska Formation (Jones and Grantz, 1967) and to the Kaguyak Formation (Keller and Reiser, 1959 (Kirschner and Lyon, 1973 (Calderwood and Fackler, 1972).…”

Section: Matanuska Terranementioning

confidence: 99%

Hydrocarbon potential, geologic hazards, and infrastructure for exploration and development of the lower Cook Inlet, Alaska

Magoon¹,

Adkinson²,

Chmelik³

et al. 1976

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Detrital Zircon Record of a Mesozoic Collisional Forearc Basin in South Central Alaska: The Tectonic Transition From an Oceanic to Continental Arc

2018

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The collision of oceanic arcs with continental margins is an important mechanism for the growth of continents. Ancient forearc basin strata in collisional orogens provide a record of the upper crustal response to this tectonic process. In south central Alaska, Mesozoic forearc basin strata are exposed in a complete crustal section. U‐Pb detrital zircon geochronology from the forearc basin strata was analyzed within a ~107 Ma stratigraphic framework. The Jurassic strata contain unimodal detrital zircon populations that become progressively younger upsection and range from 175 to 151 Ma. These strata are derived from the active oceanic Talkeetna arc. The Cretaceous strata were deposited above multiple unconformities that collectively represent as much as ~30 Ma of nondeposition and/or erosion in the forearc basin. Erosion in the forearc basin and a general absence of detrital zircon ages between 140 and 120 Ma are interpreted as a hiatus of magmatism triggered by collision of the oceanic arc with the former continental margin. The Cretaceous strata have two main detrital zircon populations: a Cretaceous population ranging from 90 to 68 Ma that becomes progressively younger upsection and a Jurassic population with a broad range of peak ages from 194 to 144 Ma. The Cretaceous population marks the establishment of an active Cretaceous continental arc following the collisional event, and the older population reflects continued erosion of the remnant Jurassic oceanic arc plutons. Our results show that detrital zircon geochronology provides a powerful approach for delineating stages of forearc basin collision and the erosion of multiple magmatic arcs.

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Cretaceous ammonites from the lower part of the Matanuska Formation, southern Alaska

Cited by 20 publications

References 8 publications

Short notes on Alaska geology 1997

Short notes on Alaska geology 1997

Hydrocarbon potential, geologic hazards, and infrastructure for exploration and development of the lower Cook Inlet, Alaska

Detrital Zircon Record of a Mesozoic Collisional Forearc Basin in South Central Alaska: The Tectonic Transition From an Oceanic to Continental Arc

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