Detrital zircon U-Pb ages of sandstones in continental red beds at Valle de Huizachal, Tamaulipas, NE Mexico: Record of Early-Middle Jurassic arc volcanism and transition to crustal extension

Abstract

Continental strata and volcanic rocks of the type Huizachal Group in Valle deHuizachal record arc magmatism and subsequent crustal extension prior to seafl oor spreading in the Gulf of Mexico. The older La Boca Formation consists of two informal members, a lower unit of siliciclastic and volcanic rocks discordantly overlain by a predominantly siliciclastic upper member. The younger La Joya Formation is an upwardfi ning, alluvial-braided fl uvial succession with a basal conglomerate. U-Pb detrital-zircon ages (n = 576) from six Huizachal Group sandstones (fi ve from La Boca and one from La Joya) consist of four groups indicating a mixed provenance: (1) Grenville grains (~1.3-1.0 Ga) derived from Gondwana (Novillo Gneiss); (2) earlymiddle Paleozoic grains (430-300 Ma) derived from peri-Gondwanan accreted rocks (Granjeno Schist); (3) Permo-Triassic grains (296-222 Ma) derived from volcanic and plutonic rocks (West Pangaean arc) and/or turbidites (Guacamaya Formation); and (4) Early-Middle Jurassic grains (199-164 Ma), locally derived from the Nazas arc. Groups 1-3 increase in abundance upsection as a result of unroofi ng of Jurassic volcanic and sedimentary carapace from uplifted basement. estratigráfi ca por debajo de depósitos inferidos del Oxfordiano.

A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: new insights on the phylogeny and biogeography of Gondwanan rhynchocephalians

“…Reynoso, 1993; Sues et al ., 1994), and China (Wu, 1994; Jones, 2006). Additionally, the diverse sphenodontians from the lower member of the La Boca Formation of Mexico (now considered to be Early Jurassic; Clark et al ., 1994; Reynoso, 1996, 2005; Rubio‐Cisneros & Lawton, 2011) and the highly derived marine Palaeopleurosaurus from Germany (Carroll, 1985) show that rhynchocephalians were well diversified by then. Conversely, the Early Jurassic records from southern landmasses are restricted to the basal sphenodontians from India ( Rebbanasaurus and Godavarisaurus ; Evans et al ., 2001) and putative clevosaurs from South Africa (Sues & Reisz, 1995) and Zimbabwe (Gow & Raath, 1977).…”

Timing of deep-water slope evolution constrained by large-n detrital and volcanic ash zircon geochronology, Cretaceous Magallanes Basin, Chile

“…Since the amount of syndepositionally formed zircon from hinterland sources present in sediment-routing systems can vary, zirconderived MDAs can only provide an estimate of true depositional age (TDA; e.g., Dickinson and Gehrels, 2009;Rubio-Cisneros and Lawton, 2011). The absence of syndepositionally formed zircon in a system may result in computation of YC2σ and YGMA MDAs that are much older than the TDA (cf.…”

Evolution of the Caribbean plate and origin of the Gulf of Mexico in light of plate motions accommodated by strike-slip faulting

“…Next, we summarize recent studies of rift-related clastic sections that reveal stratigraphic relationships and accumulation ages (Godinez-Urban et al, 2011a, 2011bRubio-Cisneros and Lawton, 2011) and, further, note faults such as Oaxaca (Alaniz-Alvarez et al, 1996;Figs. 46 and 49), the Tamaulipas-Golden Lane-Chiapas transform (Pindell, 1985; Fig.…”

“…By ca. 164 Ma (Bathonian), suffi cient movement had taken place so that extensional or transtensional basins had formed, and clastic rocks including parts of Huizachal and Todos Santos were accumulating (Godinez-Urban et al, 2011b;Rubio-Cisneros and Lawton, 2011). Klitgord et al (1984) recognized the importance of a set of Late Jurassic transforms linking segments of the early Mid-Atlantic Ridge in the southern central Atlantic Basin to ocean fl oor in the Gulf of Mexico (Fig.…”