Late Shortening and Extensional Structures and Veins in the Western Margin of the Taconic Orogen (New York to Vermont)

Lim, Chul; Kidd, William; Howe, Stephen S.

doi:10.1086/430241

Cited by 3 publications

(4 citation statements)

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“…The Taconic Orogeny was the collision of North America with an island arc during the early Middle Ordovician to Early Silurian, and associated with it was the deposition of a synorogenic wedge of clastic sediment derived from the orogenic belt to the east (Bird and Dewey 1970;Rickard 1973;Fisher 1977;Bradley and Kidd 1991;Sarwar and Friedman 1995;Lim et al 2005). The Mohawk and Champlain valleys have an average of ∼1.25 km and a maximum of 1.75 km of Ordovician strata related to this orogenic episode.…”

Section: Events That Postdate the Great Unconformity: Ta-mentioning

confidence: 99%

“…Hydrothermal fluids played a key role in the thermal history of New York (Smith and Nyahay 2004;Lim et al 2005). These fluids appear to be localized around normal or wrench faults in the Mohawk Valley south of the Adirondacks (Smith and Nya-hay 2004).…”

Section: Events That Postdate the Great Unconformity: Ta-mentioning

confidence: 99%

“…These fluids appear to be localized around normal or wrench faults in the Mohawk Valley south of the Adirondacks (Smith and Nya-hay 2004). The timing of hydrothermal fluid flow appears to coincide with the timing of fault movement, and most, but not all, studies indicate that these faults were active during the Taconic Orogeny (Bradley and Kidd 1991;Smith et al 2003;Smith 2006;Lim et al 2005). Seismic data of these faults show most of them dying out as they pass upward into the Trenton and Utica formations, which suggests that they were not reactivated during the Acadian or Alleghanian orogenies (see below); therefore, the inference is that they show Taconic displacement (Smith 2006).…”

Section: Events That Postdate the Great Unconformity: Ta-mentioning

confidence: 99%

“…The Grenville rocks, and the overlying cover sequence, have been subjected to a number of distinct Paleozoic and younger thermal events. The timing and significance of these events are not well constrained and are the subjects of considerable debate (e.g., Johnsson 1986;Sarwar and Friedman 1995;Lim et al 2005). Many thermal studies have been conducted in and around the Adirondacks to determine the timing of heating.…”

Section: Introductionmentioning

confidence: 99%

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The Thermal Evolution of the Grenville Terrane Revealed through U‐Pb and Fission‐Track Analysis of Detrital Zircon from Cambro‐Ordovician Quartz Arenites of the Potsdam and Galway Formations

Montario¹,

Garver²

2009

The Journal of Geology

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A B S T R A C TTectonothermal studies of Precambrian terranes using detrital zircons have been the domain of U-Pb dating techniques. Advancements in technology have made it possible to study the low-temperature evolution of these terranes with the fission-track (FT) dating method, and combining these two techniques provides a unique look at the thermal evolution of Precambrian terranes. Detrital zircon grains from the upper middle Cambrian to lower middle Cambrian Potsdam and Galway formations in New York State, which uncomformably overlie the Precambrian Grenville terrane, were analyzed by U-Pb and FT dating. Approximately 90% of the U-Pb ages fall between 950 and 1200 Ma, fully consistent with the idea that these zircons are derived almost entirely from Grenville-age rock. Zircon FT (ZFT) ages from the same suite of samples have component populations of ∼540, ∼780, and ∼1200 Ma, with single-grain ages as old as 2.1 Ga. The most important observations from the FT data are that there is no widespread resetting on either side of the Adirondacks, that the component populations are older than the age of deposition, and therefore that the principle population likely reflects the cooling ages of what was almost exclusively Grenville source rock. The ZFT component populations older than Grenville tectonic events (FT age 1 1.6 Ga) suggest that these old grains and the zircon with old U-Pb ages were transported from other nearby Precambrian terranes, such as the Superior and the Yavapai-Mazatzal. These FT data show that the Potsdam and Galway formations have not undergone heating significant enough to reset fission tracks in zircon since deposition and that the heating in the source rocks at 540 Ma corresponds to cooling after the breakup of Rodinia and the rifting of the Iapetus Ocean.

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Section: Events That Postdate the Great Unconformity: Ta-mentioning

confidence: 99%

Section: Events That Postdate the Great Unconformity: Ta-mentioning

confidence: 99%