Database of the geologic map of North America— Adapted from the map by J.C. Reed, Jr. and others (2005)

Garrity, Christopher P.; Soller, David R.

doi:10.3133/ds424

Cited by 73 publications

(91 citation statements)

References 3 publications

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“…Piercey and Colpron, 2009;Lamaskin, 2012). Cretaceous and early Tertiary plutons shown in black and major belts shaded in gray (from Garrity and Soller, 2009 Paleomagnetic data indicate significant northward coast-parallel transport of rocks of the CPW and SBB plutons (Plumley and others, 1982;Coe and others, 1985;Bol and others, 1992;Gallen, ms, 2008;Housen and others, 2008;O'Connell, ms, 2008), although this conclusion has been, and remains, controversial (compare Haeussler and others, 2003;and Cowan, 2003). Paleomagnetic data from Paleocene rocks of the Resurrection ophiolite (57 Ma) indicate an original paleolatitude 13 Ϯ 9°s outh of its present location (1430 Ϯ 990 km - Bol and others, 1992).…”

Section: Geologic Backgroundmentioning

confidence: 99%

Southwestern Laurentian zircons in Upper Cretaceous flysch of the Chugach-Prince William terrane in Alaska

Garver

Davidson

2015

American Journal of Science

122

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The Chugach-Prince William (CPW) terrane in southern Alaska is dominated by thick imbricated flysch, mainly Maastrichtian to Paleocene, that represents one of the thickest accretionary complexes in the world. Detrital zircons from sandstones from across the belt are dominated by grains with crystallization ages close to the age of deposition, and hence the source region supported a long-lived Late Cretaceous to Paleocene volcanic arc. The metaplutonic basement that supported this arc was made of rocks with Mesozoic zircons (Jurassic), with a minor fraction of Paleozoic (Devonian) and Precambrian grains. There is continuity of grain ages across the belt from the Shumagin Islands in the west to the eastern localities, including the Yakutat Group. Positive Hf isotopic ratios in zircons (from the arc and basement) are consistent with melting of a relatively juvenile source, and the leading source candidate is the Coast Plutonic Complex that intrudes the Wrangellia composite terrane.The small fraction of Precambrian detrital zircons, typically <5 percent, reveal two cohorts with distinct histories. A western cohort of Precambrian grains from Shumagins, Kodiak, and Prince William Sound have grain age populations and isotopic signatures consistent with a northern Laurentian source. These grains have a wide range of ages, but are dominated by populations between 1810 to 1870 Ma and 2520 to 2680 Ma. Collectively these grains have Hf (t) from ؉13.9 to -21.1, but most grains >1800 Ma have negative Hf (t) values consistent with an evolved source. Raman spectroscopy on zircons from this suite indicates total radiation damage and internal disorder is considerable and comparable to 0.5 to 1.0 Gyr of accumulated damage. Thus the source rocks had to have resided high in the crustal column for most of the Phanerozoic. An eastern cohort of Precambrian grains have grain-ages and an isotopic signature consistent with a southern Laurentian source -mainly Yavapai-Mazatzal, Mojave and the Granite-Rhyolite province of the southwest United States. These zircons are dominated by populations at ϳ1380 Ma, ϳ1485 Ma, and ϳ1722 Ma and Hf (t) values are mostly positive, ranging from ؉11.7 to -3.4. All zircons between 1436 and 1716 Ma have positive Hf (t) values, which indicate juvenile source rocks, a unique and distinctive aspect of SW Laurentia. Total radiation damage and internal disorder in this suite of detrital grains is minimal and comparable to ϳ100 Myr of accumulated damage, which requires source rocks to have been heated to amphibolite grade in the Cretaceous. Thus the low radiation damage may require derivation from in and around the arc, and not farther inland.We hypothesize that the majority of the flysch of the CPW terrane accumulated in an accretionary complex flanking what is now the Coast Plutonic Complex, but that zircons from the eastern cohort of the CPW were derived from rocks of the Sierran-Southern California-Peninsular Arc, which collapsed along a narrow tectonic corridor due to the subduction of the conjugate to the Shat...

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Section: Geologic Backgroundmentioning

confidence: 99%

Southwestern Laurentian zircons in Upper Cretaceous flysch of the Chugach-Prince William terrane in Alaska

Garver

Davidson

2015

American Journal of Science

122

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“…Sensitivity to gradient (±10%) on the resulting classification within this region shows a variability in area between -12% and +13% for the basin plain. Validation to high-resolution satellite imagery, distribution of lithological maps (e.g., Hartmann and Moosdorf, 2012), and Quaternary maps (e.g., Garrity and Soller, 2009) suggest that after a systematic analysis of gradient, above and below, the chosen threshold best represents the basin boundary.…”

Section: Uncertaintymentioning

confidence: 99%

Is the present the key to the past? A global characterization of modern sedimentary basins

Nyberg

Howell

2015

Geology

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The stratigraphic record is heavily biased because it is uniquely composed of sediments that were laid down in basins, whereas the majority of the present and historic land surface of the planet is composed of areas that are in net long-term erosion with no preservation potential. Global mapping and quantification of the distribution of currently active sedimentary basins suggest that only 16% of Earth's terrestrial land surface is within sedimentary basins; the remainder of the land is in upland areas that will not be represented in the future rock record. Furthermore, 60% of the modern basin area has an arid climate, as opposed to 27% of the land surface. Tectonic classification of modern basins indicates that intracratonic and foreland basins cover the greatest area, whereas forearc, extensional, and strike-slip basins are the least represented by area. While this modern snapshot does not account for differences in subsidence rate or basin longevity, the mapping and quantification of modern basins highlight the incompleteness of the stratigraphic record, and the importance of caution when assuming "the present is the key to the past."

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“…Gislason et al, 1996;Vigier et al, 2006). Of the 104 catchments containing basic volcanics (VB+), 72 are situated in the west, where most volcanics date from the Tertiary; the 32 other catchments located in the eastern part contain mostly Meso-or Paleozoic volcanics (Garrity and Soller, 2009). In addition, precipitation and weathering of secondary mineral phases of primary rocks may contribute to the estimated low specific bicarbonate fluxes per runoff from VB+ (e.g.…”

Section: Runoff and Lithologymentioning

confidence: 99%

Atmospheric CO2 consumption by chemical weathering in North America

Moosdorf

Hartmann

Lauerwald

et al. 2011

Geochimica et Cosmochimica Acta

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Database of the geologic map of North America— Adapted from the map by J.C. Reed, Jr. and others (2005)

Cited by 73 publications

References 3 publications

Southwestern Laurentian zircons in Upper Cretaceous flysch of the Chugach-Prince William terrane in Alaska

Southwestern Laurentian zircons in Upper Cretaceous flysch of the Chugach-Prince William terrane in Alaska

Is the present the key to the past? A global characterization of modern sedimentary basins

Atmospheric CO2 consumption by chemical weathering in North America

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