Citation:

PANGAEA.949703

Name: 40Ar/39Ar ages from muscovite collected in the far western Nepal Himalaya: Raw data
Published: 2022-10-17
License: https://creativecommons.org/licenses/by/4.0/
Keywords: cooling age; Himalaya; muscovite; Nepal; thermochronology

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Abstract:

This dataset contains the cooling age results of 3 individual 40Ar/39Ar analyses using muscovite extracted from bedrock samples collected from medium-high grade metamorphic rocks along the Api transect in far western Nepal. Bedrock samples were collected for thermochronologic cooling ages to better constrain the exhumation history of the Nepal Himalaya. 40Ar/39Ar analyses were performed at the University of Vermont Noble Gas Geochronology Laboratory. The summary results include the weighted mean age and 2σ error calculated from the 40Ar/39Ar age spectra. Where a mean age and error could not be calculated, the minimum and maximum age of individual steps in the 40Ar/39Ar age spectra were used to delimit the time window the samples were exhumed through the closure temperature.

Keyword(s):

cooling age; Himalaya; muscovite; Nepal; thermochronology

Related to:

Braza, Mary; McQuarrie, Nadine; Robinson, Delores M; Webb, Laura E (2023): Temperature, Deformation, and Mass Transfer in a Hot Orogen: Insights From Thermokinematic Forward Models for Far Western Nepal. Tectonics, 42(9), e2023TC007912, https://doi.org/10.1029/2023TC007912

Coverage:

Median Latitude: 29.861017 * Median Longitude: 80.905717 * South-bound Latitude: 29.813970 * West-bound Longitude: 80.857310 * North-bound Latitude: 29.902140 * East-bound Longitude: 80.948280

Date/Time Start: 2017-05-09T07:59:37 * Date/Time End: 2017-05-10T08:46:25

Minimum Elevation: 2025.0 m * Maximum Elevation: 3132.0 m

Event(s):

FWN17-155 * Latitude: 29.902140 * Longitude: 80.948280 * Date/Time: 2017-05-09T07:59:37 * Elevation: 3132.0 m * Location: Nepal * Method/Device: Rock sample (ROCK) * Comment: Map unit: Greater Himalaya, lithology: augen gneiss

FWN17-158 * Latitude: 29.866940 * Longitude: 80.911560 * Date/Time: 2017-05-10T03:45:54 * Elevation: 2404.0 m * Location: Nepal * Method/Device: Rock sample (ROCK) * Comment: Map unit: Ranimata Fm., lithology: biotite schist

FWN17-163 * Latitude: 29.813970 * Longitude: 80.857310 * Date/Time: 2017-05-10T08:46:25 * Elevation: 2025.0 m * Location: Nepal * Method/Device: Rock sample (ROCK) * Comment: Map unit: Ranimata Fm., lithology: quartzite

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Braza, Mary		Sample #
2	Phase	Phase		Braza, Mary
3	J-value	J-value		Braza, Mary
4	J-value, uncertainty	J-value unc	±	Braza, Mary
5	Grains, counted/analyzed	Grains	#	Braza, Mary
6	Comment	Comment		Braza, Mary		watts
7	Time in minutes	Time	min	Braza, Mary
8	Argon-38/Argon-39	38Ar/39Ar		Braza, Mary
9	Argon-38/Argon-39, error	38Ar/39Ar e	±	Braza, Mary
10	Argon-37/Argon-39	37Ar/39Ar		Braza, Mary
11	Argon-37/Argon-39, error	37Ar/39Ar e	±	Braza, Mary
12	Argon-36/Argon-39	36Ar/39Ar		Braza, Mary
13	Argon-36/Argon-39, error	36Ar/39Ar e	±	Braza, Mary
14	Argon-39	39Ar	cps	Braza, Mary
15	Argon-39, error	39Ar e	±	Braza, Mary
16	Argon-39	39Ar	%	Braza, Mary		cumul
17	Argon-40, radiogenic	40Ar*	%	Braza, Mary
18	Argon-40, radiogenic/Argon-39	40Ar*/39Ar		Braza, Mary
19	Age	Age	Ma	Braza, Mary	Age, 40Ar/39Ar Argon-Argon
20	Age, error	Age e	±	Braza, Mary	Age, 40Ar/39Ar Argon-Argon
21	Age, error, relative	Age e rel	%	Braza, Mary	Age, 40Ar/39Ar Argon-Argon
22	Argon-39/Argon-40	39Ar/40Ar		Braza, Mary
23	Argon-36/Argon-40, error	36Ar/40Ar e	±	Braza, Mary
24	Argon-36/Argon-40	36Ar/40Ar		Braza, Mary
25	Argon-36/Argon-40, error	36Ar/40Ar e	±	Braza, Mary

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

960 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event (Sample #)	2 Phase	3 J-value	4 J-value unc [±]	5 Grains [#]	6 Comment (watts)	7 Time [min]	8 38Ar/39Ar	9 38Ar/39Ar e [±]	10 37Ar/39Ar	11 37Ar/39Ar e [±]	12 36Ar/39Ar	13 36Ar/39Ar e [±]	14 39Ar [cps]	15 39Ar e [±]	16 39Ar [%] (cumul)	17 40Ar* [%]	18 40Ar*/39Ar	19 Age [Ma]	20 Age e [±]	21 Age e rel [%]	22 39Ar/40Ar	23 36Ar/40Ar e [±]	24 36Ar/40Ar	25 36Ar/40Ar e [±]
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	4.2	1	3.44202E-2	3.43781E-3	5.62185E-3	6.35762E-3	1.58316E-1	1.08724E-2	177.9	1.9	0.05	-4.3	-1.72898E0	-8.76074	2.74017	-31.277785800	2.20694E-2	2.61380E-4	3.49394E-3	2.37953E-4
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	4.5	1	1.85533E-2	6.23117E-4	7.87527E-4	1.21605E-4	4.07523E-2	1.60305E-3	1269.8	9.3	0.43	4.3	6.09735E-1	3.07956	0.51962	16.873158650	7.86560E-2	6.33581E-4	3.20541E-3	1.24304E-4
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	4.7	1	1.49089E-2	2.03344E-4	5.42836E-5	8.47183E-5	1.42738E-2	2.41931E-4	18421.8	79.9	5.84	40.4	2.92671E0	14.73475	0.18015	1.222601542	1.39802E-1	6.54283E-4	1.99551E-3	3.28825E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	4.8	1	1.34290E-2	1.40571E-4	3.17921E-5	1.17975E-5	6.03290E-3	1.24062E-4	31454.3	133.6	15.09	62.9	3.07954E0	15.50096	0.13129	0.847002574	2.05894E-1	9.52989E-4	1.24214E-3	2.50970E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	4.9	1	1.27264E-2	1.57128E-4	3.87890E-5	3.61131E-5	4.04928E-3	8.49508E-5	25780.5	108.9	22.67	72.0	3.12399E0	15.72373	0.11981	0.761960618	2.31921E-1	1.05786E-3	9.39114E-4	1.93662E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	5	1	1.28359E-2	1.47994E-4	3.39879E-5	1.16916E-5	3.34857E-3	7.59060E-5	29422.2	122.5	31.33	71.4	2.51421E0	12.66519	0.09549	0.753969310	2.85968E-1	1.27260E-3	9.57582E-4	2.13905E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	5.1	1	1.30502E-2	3.12798E-4	3.26439E-5	1.11476E-5	2.90629E-3	7.26144E-5	30633.6	136.4	40.33	75.9	2.74311E0	13.81388	0.11167	0.808407251	2.78298E-1	1.45402E-3	8.08816E-4	2.00076E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	5.2	1	1.37201E-2	3.90409E-4	5.50633E-5	2.67062E-5	3.94489E-3	1.13040E-4	18160.9	88.1	45.67	68.5	2.58080E0	12.99942	0.12224	0.940329415	2.67358E-1	1.54131E-3	1.05470E-3	2.99657E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	5.5	1	1.27448E-2	1.11422E-4	1.23724E-5	9.64689E-7	3.30008E-3	5.39997E-5	80825.3	329.7	69.44	72.1	2.56921E0	12.94124	0.09459	0.730937393	2.82708E-1	1.21328E-3	9.32959E-4	1.48362E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	5.8	1	1.27674E-2	1.26740E-4	1.93415E-5	2.75395E-6	4.25237E-3	5.14885E-5	51702.2	213.7	84.65	63.7	2.24374E0	11.30687	0.09214	0.814920809	2.86020E-1	1.26879E-3	1.21626E-3	1.39797E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	6.5	1	1.22700E-2	1.82912E-4	5.45433E-5	2.61563E-5	1.58580E-3	1.39162E-4	18334.1	78.5	90.04	81.6	2.11059E0	10.63783	0.07660	0.720064565	3.88864E-1	1.84014E-3	6.16660E-4	5.40650E-5
FWN17-155	white mica	2.76200E-3	1.18766E-5	5	fuse	1	1.23538E-2	1.52272E-4	2.95156E-5	7.76564E-6	6.55566E-4	7.31796E-5	33880.3	141.9	100.00	91.8	2.20348E0	11.10464	0.07261	0.653855087	4.18816E-1	1.90156E-3	2.74562E-4	3.06310E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.1	1	2.06425E-2	7.80644E-4	7.67579E-4	9.41542E-4	4.07538E-2	1.60696E-3	1302.8	8.8	0.23	38.1	7.59747E0	37.96625	0.72378	1.906375168	5.08460E-2	3.66941E-4	2.07217E-3	8.06882E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.2	1	2.81693E-2	5.19650E-4	3.39892E-4	1.49058E-3	1.80462E-2	7.16490E-4	2942.1	24.1	0.73	0.0	-1.39087E0	-7.03657	4.85126	-68.943552600	2.51410E-1	6.01925E-2	4.53701E-3	1.09983E-3
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.3	1	1.52893E-2	2.74891E-4	2.17704E-4	1.20371E-4	1.85128E-2	4.72829E-4	4593.4	22.5	1.53	32.8	2.73251E0	13.74584	0.22742	1.654481962	1.21668E-1	6.45522E-4	2.25241E-3	5.66439E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.4	1	1.38121E-2	1.85320E-4	4.36729E-5	2.78518E-5	6.49860E-3	1.03957E-4	22897.5	96.4	5.49	55.9	2.47736E0	12.46666	0.11553	0.926750882	2.27476E-1	1.05126E-3	1.47828E-3	2.29886E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.45	1	1.24281E-2	1.37544E-4	2.26735E-5	6.47912E-6	1.69882E-3	4.86973E-5	44104.4	181.8	13.13	81.9	2.30567E0	11.60540	0.08035	0.692384358	3.57231E-1	1.59519E-3	6.06872E-4	1.72469E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.5	1	1.25285E-2	1.56199E-4	4.01756E-5	8.76445E-6	2.82710E-3	8.61184E-5	24890.7	104.9	17.44	73.4	2.33894E0	11.77236	0.08967	0.761728590	3.15696E-1	1.46406E-3	8.92503E-4	2.69814E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.6	1	1.33275E-2	1.51783E-4	3.42249E-5	1.43065E-5	3.89530E-3	7.72469E-5	29218.5	121.2	22.50	66.9	2.36708E0	11.91350	0.09330	0.783170155	2.84662E-1	1.25417E-3	1.10884E-3	2.15663E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.7	1	1.28417E-2	1.54607E-4	3.73339E-5	8.64146E-6	2.90544E-3	1.25079E-4	26785.3	111.8	27.14	77.6	3.02624E0	15.21730	0.14048	0.923183300	2.58080E-1	1.64666E-3	7.49836E-4	3.23313E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.8	1	1.34343E-2	1.70527E-4	3.22925E-5	5.81322E-6	5.10053E-3	7.74845E-5	30966.9	129.8	32.50	70.5	3.66052E0	18.39077	0.13980	0.760158124	1.93873E-1	8.64233E-4	9.88855E-4	1.45160E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	4.9	1	1.28517E-2	1.37251E-4	2.51138E-5	4.56420E-6	3.59757E-3	5.80657E-5	39818.8	165.2	39.39	72.7	2.87599E0	14.46476	0.10735	0.742174299	2.54396E-1	1.12632E-3	9.15206E-4	1.43450E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	5	1	1.27277E-2	1.89811E-4	2.02075E-5	2.56421E-5	2.72838E-3	4.76675E-5	49486.5	217.8	47.96	75.9	2.58042E0	12.98344	0.10542	0.811989686	2.95984E-1	1.55612E-3	8.07559E-4	1.38500E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	5.1	1	1.28957E-2	1.27300E-4	1.63003E-5	1.95898E-6	4.14204E-3	7.21221E-5	61348.7	251.9	58.58	67.1	2.53809E0	12.77122	0.10013	0.784008188	2.66212E-1	1.17842E-3	1.10266E-3	1.87472E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	5.2	1	1.26286E-2	1.22951E-4	1.91628E-5	2.61562E-6	2.70231E-3	4.74879E-5	52184.4	214.4	67.61	76.8	2.68345E0	13.49995	0.09708	0.719101294	2.87908E-1	1.28205E-3	7.78016E-4	1.33603E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	5.3	1	1.28241E-2	1.48202E-4	2.97454E-5	6.15960E-6	2.65608E-3	6.60612E-5	33618.7	141.2	73.43	76.0	2.52704E0	12.71580	0.09280	0.729836056	3.02667E-1	1.36450E-3	8.03907E-4	1.97517E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	5.5	1	1.28235E-2	1.87121E-4	4.07531E-5	7.83467E-6	2.85862E-3	8.52498E-5	24538.0	103.2	77.68	74.5	2.50483E0	12.60444	0.09451	0.749776705	2.99219E-1	1.37661E-3	8.55354E-4	2.53035E-5
FWN17-158	white mica	2.75900E-3	1.18637E-5	6	fuse	1	1.23846E-2	9.45415E-5	7.75781E-6	5.57620E-7	1.48405E-3	2.00484E-5	128902.4	524.4	100.00	85.4	2.60452E0	13.10428	0.08528	0.650746686	3.29722E-1	1.38338E-3	4.89324E-4	6.32342E-6
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.2	1	1.21961E-2	2.23517E-4	1.54088E-4	1.65636E-4	1.77425E-3	3.92461E-4	6489.8	37.4	5.07	81.0	2.26569E0	11.39243	0.10659	0.935654694	3.59435E-1	2.45752E-3	6.37727E-4	1.41036E-4
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.3	1	1.20241E-2	1.74674E-4	9.63734E-5	1.38394E-5	6.07216E-4	2.65491E-4	10376.3	46.1	13.19	88.8	1.44508E0	7.27442	0.05558	0.764083666	6.17733E-1	3.53923E-3	3.75097E-4	1.64000E-4
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.4	1	1.22029E-2	2.21971E-4	7.70853E-5	7.86184E-6	4.12247E-4	2.06852E-4	12972.6	57.6	23.33	93.6	1.81889E0	9.15141	0.06240	0.681884184	5.17364E-1	2.64462E-3	2.13282E-4	1.07015E-4
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.5	1	1.22705E-2	2.38347E-4	7.97985E-5	7.29262E-6	2.93503E-4	1.97896E-4	12531.6	64.7	33.13	97.1	2.92369E0	14.68779	0.11573	0.787952745	3.33666E-1	2.19044E-3	9.79320E-5	6.60304E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.6	1	1.22067E-2	2.16688E-4	5.99760E-5	4.23228E-6	1.44856E-4	1.52685E-4	16673.3	81.0	46.16	99.1	4.68736E0	23.49128	0.16457	0.700543761	2.12409E-1	1.20678E-3	3.07687E-5	3.24314E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.7	1	1.21611E-2	1.86936E-4	5.25922E-5	3.26165E-6	9.88260E-5	1.37455E-4	19014.2	82.1	61.03	99.6	6.71759E0	33.57317	0.20483	0.610104171	1.48931E-1	6.80954E-4	1.47182E-5	2.04711E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.75	1	1.21825E-2	2.73266E-4	9.27556E-5	3.64153E-5	-1.41601E-4	-2.36820E-4	10781.0	48.0	69.46	100.0	6.90319E0	34.49209	0.21830	0.632895321	1.46464E-1	7.21871E-4	-2.07395E-5	-3.46855E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.8	1	1.18644E-2	2.58830E-4	1.83114E-4	3.65203E-5	-7.76466E-4	-4.41004E-4	5461.1	26.5	73.73	100.0	6.90461E0	34.49909	0.22658	0.656765478	1.50593E-1	8.11621E-4	-1.16931E-4	-6.64105E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	4.95	1	1.22038E-2	2.76984E-4	9.72238E-5	1.48511E-5	9.40720E-4	1.78990E-4	10285.5	46.2	81.77	96.5	7.86127E0	39.22821	0.25218	0.642848540	1.23418E-1	6.00556E-4	1.16102E-4	2.20856E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	5.25	1	1.32015E-2	3.18135E-4	1.16000E-4	1.08214E-5	1.58158E-3	2.96317E-4	8620.7	38.9	88.51	93.3	6.59684E0	32.97510	0.21656	0.656753037	1.42152E-1	6.90481E-4	2.24825E-4	4.21119E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	5.8	1	1.16331E-2	1.69821E-4	1.05334E-4	7.87516E-6	1.75711E-5	2.84855E-4	9493.6	43.4	95.93	99.9	6.79860E0	33.97430	0.22060	0.649329020	1.47693E-1	7.54372E-4	2.59512E-6	4.20710E-5
FWN17-163	white mica	2.75600E-3	1.12996E-5	4	fuse	1	1.20274E-2	2.70607E-4	1.92153E-4	1.32060E-5	-9.59180E-4	-5.96375E-4	5204.2	33.3	100.00	100.0	9.65697E0	48.07211	1.10247	2.293366028	1.07239E-1	2.52756E-3	-1.02862E-4	-6.39939E-5