In situ rutile U-Pb dating by laser ablation-MC-ICPMS

Xia, Xiaoping; Ren, Zhong‐Yuan; Wei, Gangjian; Le, Zhang; Sun, Min; Wang, Yuejun

doi:10.2343/geochemj.2.0267

Cited by 35 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the R19 and RZ3 secondary standards, mean 207 Pb-corrected ages of 489.6 ± 2.1 Ma and 1806 ± 12 Ma were obtained, respectively. The former is indistinguishable from the accepted age of 489.5 ± 0.9 Ma (Luvizotto et al, 2009); the latter is ~0.4% outside the 2s uncertainty limit of the 1777 ± 10 Ma age originally reported by Shi et al (2012), but it is indistinguishable from the revised age of 1781 ± 15 Ma (Xia et al, 2013).…”

Section: Rutile U-pb Geochronology Andcontrasting

confidence: 60%

Spatial and temporal trends in exhumation of the Eastern Himalaya and syntaxis as determined from a multitechnique detrital thermochronological study of the Bengal Fan

et al. 2019

View full text Add to dashboard Cite

The Bengal Fan provides a Neogene record of Eastern and Central Himalaya exhumation. We provide the first detrital thermochronological study (apatite and rutile U-Pb, mica Ar-Ar, zircon fission track) of sediment samples collected during International Ocean Discovery Program (IODP) Expedition 354 to the mid–Bengal Fan. Our data from rutile and zircon fission-track thermochronometry show a shift in lag times over the interval 5.59–3.47 Ma. The oldest sample with a lag time of <1 m.y. has a depositional age between 3.76 and 3.47 Ma, and these short lag times continue to be recorded upward in the core to the youngest sediments analyzed, deposited at <1 Ma. We interpret the earliest record of short lag times to represent the onset of extremely rapid exhumation of the Eastern Himalayan syntaxial massif, defined as the syntaxial region north of the Nam La Thrust. Below the interval characterized by short lag times, the youngest sample analyzed with long lag times (>6 m.y.) has a depositional age of 5.59–4.50 Ma, and the zircon and rutile populations then show a static peak until >12 Ma. This interval, from 5.59–4.50 Ma to >12 Ma, is most easily interpreted as recording passive erosion of the Greater Himalaya. However, single grains with lag times of <4 m.y., but with high analytical uncertainty, are recorded over this interval. For sediments older than 10 Ma, these grains were derived from the Greater Himalaya, which was exhuming rapidly until ca. 14 Ma. In sediments younger than 10 Ma, these grains could represent slower, yet still rapid, exhumation of the syntaxial antiform to the south of the massif. Lag times <1 m.y. are again recorded from 14.5 Ma to the base of the studied section at 17 Ma, reflecting a period of Greater Himalayan rapid exhumation. Mica 40Ar/39Ar and apatite U-Pb data are not sensitive to syntaxial exhumation: We ascribe this to the paucity of white mica in syntaxial lithologies, and to high levels of common Pb, resulting in U-Pb ages associated with unacceptably high uncertainties, respectively.

show abstract

Section: Rutile U-pb Geochronology Andcontrasting

confidence: 60%

Spatial and temporal trends in exhumation of the Eastern Himalaya and syntaxis as determined from a multitechnique detrital thermochronological study of the Bengal Fan

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Both U‐Pb dating and Hf isotope analyses were conducted using a Neptune plus multicollector inductively coupled plasma mass spectrometer (MC‐ICP‐MS) with a RESOlution M‐50193‐nm laser ablation system at the State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). Detailed equipment configuration was given in Xia et al () and L. Zhang, Ren, et al (). Detailed metadata for the LA‐ICP‐MS U‐Pb dating were given in Table S2, following the recommendations outlined by Horstwood et al ().…”

Section: Analytical Techniquesmentioning

confidence: 99%

When Did the Paleotethys Ailaoshan Ocean Close: New Insights From Detrital Zircon U‐Pb age and Hf Isotopes

Xia

Lai

et al. 2019

Tectonics

View full text Add to dashboard Cite

We present new laser ablation (LA)‐multicollector‐inductively coupled plasma mass spectrometry detrital zircon U‐Pb age and Hf isotope data of the Triassic sedimentary rocks from the eastern and western sides of the Ailaoshan suture in SW China, which separate the Indochina and South China blocks. Detrital zircon grains of the Lower‐Middle Triassic sequences from western South China show single age population of 280–237 Ma (peak at 254–251 Ma) with mainly positive εHf(t) values (+0.15 to +9.11, ~60%). The Middle Triassic samples from eastern Indochina also contain single age population of 273–236 Ma (peak at 246–242 Ma), but with mainly negative εHf(t) values (−18.95 to −1.83, ~88%). The unimodal detrital zircon age pattern and Hf isotope features suggest that the Permian‐Triassic magmatic arcs had supplied detritus for the Lower‐Middle Triassic sequences on both sides of the Ailaoshan suture. In contrast, the Upper Triassic sequences on the either side of the suture display similar polymodal age populations at 290–230, 500–400, 850–700, 1000–900, 2000–1800, and 2600–2400 Ma. This indicates a dramatic change in detrital provenance across the Middle‐Late Triassic boundary. We interpret this change to be resulted from the closure of the Paleotethyan Ailaoshan Ocean in the early Late Triassic. The ocean closure and consequent Indochina‐South China continent‐continent collision may have connected the drainage systems of the two blocks, leading to the marked similarities in their post‐Middle Triassic sedimentary provenance.

show abstract

“…U. U-Pb analysis of the other samples were conducted using a Neptune plus multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) with RESOlution M-50 193 nm laser ablation system at the State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS). The equipment configuration details were provided by Xia et al (2013).…”

Section: Zircon U-pb Datingmentioning

confidence: 99%

Where was the Ailaoshan Ocean and when did it open: A perspective based on detrital zircon U–Pb age and Hf isotope evidence

et al. 2016

Self Cite

View full text Add to dashboard Cite

In situ rutile U-Pb dating by laser ablation-MC-ICPMS

Cited by 35 publications

References 19 publications

Spatial and temporal trends in exhumation of the Eastern Himalaya and syntaxis as determined from a multitechnique detrital thermochronological study of the Bengal Fan

Spatial and temporal trends in exhumation of the Eastern Himalaya and syntaxis as determined from a multitechnique detrital thermochronological study of the Bengal Fan

When Did the Paleotethys Ailaoshan Ocean Close: New Insights From Detrital Zircon U‐Pb age and Hf Isotopes

Where was the Ailaoshan Ocean and when did it open: A perspective based on detrital zircon U–Pb age and Hf isotope evidence

Contact Info

Product

Resources

About