scholarly journals Supplemental Material: Detrital zircon geochronology and provenance of the Middle to Late Jurassic Paradox Basin and Central Colorado trough: Paleogeographic implications for southwestern Laurentia

2021 ◽  
Author(s):  
J.I. Ejembi ◽  
et al.
Keyword(s):  
Rare Earth ◽  
Detrital Zircon ◽  
Late Jurassic ◽  
Zircon Geochronology ◽  
Detrital Zircon Geochronology ◽  
Paradox Basin ◽  
Elemental Geochemistry ◽  
Igneous Zircon ◽  
Ree Patterns

<div>Table S1: Peak analyses of age clusters. Figure S1: Chondrite-normalized REE patterns in detrital zircon. Figure S2: LREE-HREE ratio plots. File S1: Detrital zircon U-Pb age data (this study and from Potter-McIntyre et al., 2016). File S2: U-Pb age peaks analysis. File S3: End Member analysis. File S4: Rare earth elemental geochemistry analysis in detrital zircon. File S5: Rare earth elemental geochemistry analysis in igneous zircon.<br></div>

scholarly journals Supplemental Material: Detrital zircon geochronology and provenance of the Middle to Late Jurassic Paradox Basin and Central Colorado trough: Paleogeographic implications for southwestern Laurentia

2021 ◽  
Author(s):  
J.I. Ejembi ◽  
et al.
Keyword(s):  
Rare Earth ◽  
Detrital Zircon ◽  
Late Jurassic ◽  
Zircon Geochronology ◽  
Detrital Zircon Geochronology ◽  
Paradox Basin ◽  
Elemental Geochemistry ◽  
Igneous Zircon ◽  
Ree Patterns

<div>Table S1: Peak analyses of age clusters. Figure S1: Chondrite-normalized REE patterns in detrital zircon. Figure S2: LREE-HREE ratio plots. File S1: Detrital zircon U-Pb age data (this study and from Potter-McIntyre et al., 2016). File S2: U-Pb age peaks analysis. File S3: End Member analysis. File S4: Rare earth elemental geochemistry analysis in detrital zircon. File S5: Rare earth elemental geochemistry analysis in igneous zircon.<br></div>

scholarly journals Detrital zircon geochronology and provenance of the Middle to Late Jurassic Paradox Basin and Central Colorado trough: Paleogeographic implications for southwestern Laurentia

Geosphere ◽  
2021 ◽  
Author(s):  
John I. Ejembi ◽  
Sally L. Potter-McIntyre ◽  
Glenn R. Sharman ◽  
Tyson M. Smith ◽  
Joel E. Saylor ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Detrital Zircon ◽  
Late Jurassic ◽  
Upper Jurassic ◽  
Morrison Formation ◽  
Detrital Zircon Geochronology ◽  
Sediment Dispersal ◽  
Paradox Basin ◽  
Southern Oklahoma ◽  
Trace Elemental

Middle to Upper Jurassic strata in the Paradox Basin and Central Colorado trough (CCT; south­western United States) record a pronounced change in sediment dispersal from dominantly aeolian deposition with an Appalachian source (Entrada Sandstone) to dominantly fluvial deposi­tion with a source in the Mogollon and/or Sevier orogenic highlands (Salt Wash Member of the Morrison Formation). An enigmatic abundance of Cambrian (ca. 527–519 Ma) grains at this prove­nance transition in the CCT at Escalante Canyon, Colorado, was recently suggested to reflect a local sediment source from the Ancestral Front Range, despite previous interpretations that local base­ment uplifts were largely buried by Middle to Late Jurassic time. This study aims to delineate spatial and tem­poral patterns in provenance of these Jurassic sandstones containing Cambrian grains within the Paradox Basin and CCT using sandstone petrog­raphy, detrital zircon U-Pb geochronology, and detrital zircon trace elemental and rare-earth ele­mental (REE) geochemistry. We report 7887 new U-Pb detrital zircon analyses from 31 sandstone samples collected within seven transects in west­ern Colorado and eastern Utah. Three clusters of zircon ages are consistently present (1.53–1.3 Ga, 1.3–0.9 Ga, and 500–300 Ma) that are interpreted to reflect sources associated with the Appalachian orogen in southeastern Laurentia (mid-continent, Grenville, Appalachian, and peri-Gondwanan terranes). Ca. 540–500 Ma zircon grains are anom­alously abundant locally in the uppermost Entrada Sandstone and Wanakah Formation but are either lacking or present in small fractions in the overlying Salt Wash and Tidwell Members of the Morrison Formation. A comparison of zircon REE geochem­istry between Cambrian detrital zircon and igneous zircon from potential sources shows that these 540–500 Ma detrital zircon are primarily magmatic. Although variability in both detrital and igneous REE concentrations precludes definitive identifica­tion of provenance, several considerations suggest that distal sources from the Cambrian granitic and rhyolitic provinces of the Southern Oklahoma aulacogen is also likely, in addition to a proximal source identified in the McClure Mountain syenite of the Wet Mountains, Colorado. The abundance of Cambrian grains in samples from the central CCT, particularly in the Entrada Sandstone and Wana­kah Formation, suggests northwesterly sediment transport within the CCT, with sediment sourced from Ancestral Rocky Mountains uplifts of the southern Wet Mountains and/or Amarillo-Wichita Mountains in southwestern Oklahoma. The lack of Cambrian grains within the Paradox Basin sug­gests that the Uncompahgre uplift (southwestern Colorado) acted as a barrier to sediment transport from the CCT.

FROM ISOTOPES TO ICE: CONSTRAINING SW GONDWANA ICE SOURCES VIA DETRITAL ZIRCON GEOCHRONOLOGY DURING THE LPIA

2016 ◽  
Author(s):  
Neil Griffis ◽  
◽  
Nicholas D. Fedorchuk ◽  
Isabel P. Montañez ◽  
John L. Isbell ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Zircon Geochronology ◽  
Detrital Zircon Geochronology ◽  
Sw Gondwana
Sign in / Sign up

Export Citation Format

Share Document