Citation:

PANGAEA.960122

Name: (U-Th)/He ages from zircons collected in the far western Nepal Himalaya: raw data
Published: 2023-08-24
License: https://creativecommons.org/licenses/by/4.0/
Keywords: cooling age; Himalaya; Nepal; thermochronology; ZHe; zircon (U-Th)/He thermochronology

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Published: 2023-08-24 • DOI registered: 2023-09-22

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Abstract:

This dataset contains the results of 11 individual (U-Th)/He analyses using zircons extracted from bedrock samples collected from medium-high grade metamorphic rocks along the Api transect in the far western Nepal Himalaya. Bedrock samples were collected for thermochronologic cooling ages to better constrain the exhumation history of the Nepal Himalaya. Analytical methods followed the general procedures outlined in Reiners (2005) and Reiners et al. (2004). The Full ZHe Data Raw contains results for each zircon grain measurement (typically three per sample).

Keyword(s):

cooling age; Himalaya; Nepal; thermochronology; ZHe; zircon (U-Th)/He thermochronology

References:

Reiners, Peter W (2005): Zircon (U-Th)/He Thermochronometry. Reviews in Mineralogy & Geochemistry, 58(1), 151-179, https://doi.org/10.2138/rmg.2005.58.6

Reiners, Peter W; Spell, Terry L; Nicolescu, Stefan; Zanetti, Kathleen A (2004): Zircon (U-Th)/He thermochronometry: He diffusion and comparisons with 40Ar/39Ar dating. Geochimica et Cosmochimica Acta, 68(8), 1857-1887, https://doi.org/10.1016/j.gca.2003.10.021

Coverage:

Median Latitude: 29.535747 * Median Longitude: 80.741245 * South-bound Latitude: 29.096190 * West-bound Longitude: 80.569530 * North-bound Latitude: 29.902140 * East-bound Longitude: 80.948280

Date/Time Start: 2017-05-04T03:39:38 * Date/Time End: 2017-05-18T03:46:37

Minimum Elevation: 1459.0 m * Maximum Elevation: 3132.0 m

Event(s):

FWN17-110B * Latitude: 29.096190 * Longitude: 80.569530 * Elevation: 1461.0 m * Location: Nepal * Method/Device: Rock sample (ROCK) * Comment: Map unit: Sangram Fm., lithology: quartzite

FWN17-111 * Latitude: 29.179280 * Longitude: 80.606310 * Elevation: 2045.0 m * Location: Nepal * Method/Device: Rock sample (ROCK) * Comment: Map unit: Greater Himalaya, lithology: quartzite

FWN17-112 * Latitude: 29.236390 * Longitude: 80.626000 * Elevation: 1926.0 m * Location: Nepal * Method/Device: Rock sample (ROCK) * Comment: Map unit: Greater Himalaya, lithology: augen gneiss

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		Braza, Mary
2	Latitude of event	Latitude		Braza, Mary
3	Longitude of event	Longitude		Braza, Mary
4	Elevation of event	Elevation	m	Braza, Mary
5	Sample code/label	Sample label		Braza, Mary
6	Location	Location		Braza, Mary	Map unit
7	Main Lithology	Main lith		Braza, Mary
8	Uranium	U	ng	Braza, Mary
9	Thorium	Th	ng	Braza, Mary
10	Uranium/Thorium ratio	U/Th		Braza, Mary
11	Age, mineral	Age mineral	Ma	Braza, Mary	raw age
12	Age, mineral, standard deviation	Age mineral std dev	±	Braza, Mary	1s
13	alpha-ejection correction	Ft		Braza, Mary	Ft 238U
14	alpha-ejection correction	Ft		Braza, Mary	Ft 235U
15	alpha-ejection correction	Ft		Braza, Mary	Ft 232Th
16	alpha-ejection correction	Ft		Braza, Mary	Ft 147Sm
17	Size	Size	µm	Braza, Mary	Rs: width of the rims around the crystals
18	Age, mineral	Age mineral	Ma	Braza, Mary	corrected age
19	Age, mineral, standard deviation	Age mineral std dev	±	Braza, Mary	1s
20	Mass	Mass	g	Braza, Mary
21	Uranium	U	mg/kg	Braza, Mary	ppm U (Zr)
22	Thorium	Th	mg/kg	Braza, Mary	ppm Th (Zr)
23	Helium-4	4He	nmol/kg	Braza, Mary
24	Uranium	U	mg/kg	Braza, Mary	ppm eU (Zr)
25	Ratio	Ratio		Braza, Mary	eU (morph)/eU (Zr)

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)

Size:

693 data points

Data

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

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 Sample label	6 Location (Map unit)	7 Main lith	8 U [ng]	9 Th [ng]	10 U/Th	11 Age mineral [Ma] (raw age)	12 Age mineral std dev [±] (1s)	13 Ft (Ft 238U)	14 Ft (Ft 235U)	15 Ft (Ft 232Th)	16 Ft (Ft 147Sm)	17 Size [µm] (Rs: width of the rims around ...)	18 Age mineral [Ma] (corrected age)	19 Age mineral std dev [±] (1s)	20 Mass [g]	21 U [mg/kg] (ppm U (Zr))	22 Th [mg/kg] (ppm Th (Zr))	23 4He [nmol/kg]	24 U [mg/kg] (ppm eU (Zr))	25 Ratio (eU (morph)/eU (Zr))
FWN17-110B	29.0962	80.5695	1461	19B902_FWN17_110B_Zr1	Sangram	quartzite	0.458847482	0.291496177	0.651716778	7.975493937	0.102788313	0.747	0.710	0.710	0.919	47.34	10.77	0.14	3.05E-06	150.23	95.44	7430	172.65	0.78
FWN17-110B	29.0962	80.5695	1461	19B903_FWN17_110B_Zr2	Sangram	quartzite	3.362634624	0.865939659	0.264181463	52.833678360	0.707481948	0.692	0.650	0.650	0.901	38.26	76.60	1.03	1.97E-06	1703.21	438.61	516617	1806.28	0.73
FWN17-110B	29.0962	80.5695	1461	19B904_FWN17_110B_Zr3	Sangram	quartzite	1.385629486	0.130966140	0.096963058	2.659584239	0.036658608	0.688	0.645	0.645	0.899	37.67	3.88	0.05	1.25E-06	1111.13	105.02	16273	1135.81	0.70
FWN17-111	29.1793	80.6063	2045	19B896_FWN17_111_Zr1	Greater Himalaya	quartzite	4.359280135	1.213518808	0.285578906	10.448115880	0.139247291	0.766	0.732	0.732	0.926	51.51	13.70	0.18	4.18E-06	1042.44	290.19	62581	1110.63	0.75
FWN17-111	29.1793	80.6063	2045	19B897_FWN17_111_Zr2	Greater Himalaya	quartzite	6.597611529	2.068064462	0.321567184	12.400183210	0.160601535	0.794	0.763	0.763	0.935	59.03	15.68	0.20	6.80E-06	970.63	304.25	69710	1042.13	0.91
FWN17-111	29.1793	80.6063	2045	19B898_FWN17_111_Zr3	Greater Himalaya	quartzite	3.493288654	0.445028125	0.130691510	11.587355100	0.159435717	0.772	0.739	0.739	0.928	52.98	15.05	0.21	4.88E-06	715.22	91.12	46022	736.63	0.85
FWN17-112	29.2364	80.6260	1926	19B905_FWN17_112_Zr1	Greater Himalaya	augen gneiss	9.310504059	0.590317239	0.065043914	10.097799540	0.142919493	0.799	0.769	0.769	0.937	60.66	12.66	0.18	6.00E-06	1552.70	98.45	85773	1575.84	0.77
FWN17-112	29.2364	80.6260	1926	19B906_FWN17_112_Zr2	Greater Himalaya	augen gneiss	1.268598583	0.186699018	0.150977491	10.460112120	0.143485975	0.682	0.638	0.638	0.897	36.88	15.40	0.21	2.06E-06	614.86	90.49	35875	636.13	0.83
FWN17-112	29.2364	80.6260	1926	19B907_FWN17_112_Zr3	Greater Himalaya	augen gneiss	1.201705151	0.172051623	0.146877490	11.804849390	0.166186957	0.711	0.670	0.670	0.907	40.98	16.67	0.24	2.01E-06	599.25	85.80	39428	619.42	0.82
FWN17-115	29.3642	80.6244	1884	19B899_FWN17_115_Zr1	Greater Himalaya	augen gneiss	1.761565496	0.318037439	0.185214014	8.889397271	0.119164555	0.732	0.694	0.694	0.914	44.45	12.20	0.16	3.07E-06	573.16	103.48	28634	597.48	0.83
FWN17-115	29.3642	80.6244	1884	19B900_FWN17_115_Zr2	Greater Himalaya	augen gneiss	6.520681707	1.710603896	0.269123020	9.452038613	0.125007951	0.786	0.755	0.755	0.932	56.76	12.07	0.16	5.72E-06	1140.04	299.07	61689	1210.32	0.87
FWN17-115	29.3642	80.6244	1884	19B901_FWN17_115_Zr3	Greater Himalaya	augen gneiss	1.764026070	0.395487912	0.229997231	8.954862881	0.119875711	0.746	0.710	0.710	0.919	47.31	12.04	0.16	3.63E-06	486.25	109.01	24714	511.87	0.73
FWN17-119	29.4704	80.6571	2261	19B915_FWN17_119_Zr1	Syangia	quartzite	0.388987008	0.173998618	0.458886303	5.641569989	0.073613190	0.659	0.613	0.613	0.889	34.16	8.63	0.11	1.02E-06	379.77	169.88	12768	419.69	0.73
FWN17-119	29.4704	80.6571	2261	19B916_FWN17_119_Zr2	Syangia	quartzite	2.208574072	0.889434511	0.413139195	7.531378449	0.096397792	0.761	0.727	0.727	0.924	50.43	9.95	0.13	3.28E-06	674.08	271.47	29971	737.88	0.79
FWN17-119	29.4704	80.6571	2261	19B917_FWN17_119_Zr3	Syangia	quartzite	1.465636541	1.015802825	0.711012971	6.836528556	0.085590252	0.739	0.702	0.702	0.917	45.93	9.32	0.12	2.13E-06	688.84	477.42	29549	801.03	0.71
FWN17-131B	29.6475	80.6969	2078	19B911_FWN17_131B_Zr1	Ranimata	augen gneiss	2.314665835	0.503869540	0.223318239	5.835916999	0.078735103	0.791	0.760	0.760	0.934	58.22	7.40	0.10	6.38E-06	362.56	78.92	11988	381.11	0.77
FWN17-131B	29.6475	80.6969	2078	19B912_FWN17_131B_Zr2	Ranimata	augen gneiss	1.526522089	0.982434321	0.660229347	9.668588892	0.119675372	0.804	0.776	0.776	0.938	62.49	12.09	0.15	7.54E-06	202.59	130.38	12169	233.23	0.70
FWN17-131B	29.6475	80.6969	2078	19B913_FWN17_131B_Zr3	Ranimata	augen gneiss	1.541293618	0.433514782	0.288544581	5.301874884	0.071178925	0.784	0.752	0.752	0.932	56.20	6.79	0.09	4.55E-06	338.69	95.26	10320	361.07	0.74
FWN17-141	29.7933	80.8301	1459	19B918_FWN17_141_Zr1	Kushma	quartzite	5.910857768	14.376071060	2.495077808	1.356087927	0.014346984	0.833	0.808	0.808	0.948	73.85	1.65	0.02	1.45E-05	406.93	989.72	4689	639.52	0.74
FWN17-141	29.7933	80.8301	1459	19B919_FWN17_141_Zr2	Kushma	quartzite	4.937622077	11.643251860	2.419083378	1.196145040	0.012881407	0.803	0.774	0.774	0.938	61.99	1.51	0.02	9.00E-06	548.60	1293.64	5513	852.61	0.88
FWN17-141	29.7933	80.8301	1459	19B920_FWN17_141_Zr3	Kushma	quartzite	1.884504202	1.655873914	0.901414513	1.267001439	0.015355793	0.768	0.734	0.734	0.926	52.04	1.66	0.02	3.57E-06	527.64	463.62	4351	636.59	0.79
FWN17-145	29.8192	80.8624	2041	19B921_FWN17_145_Zr1	Ranimata	quartzite	1.758166791	0.557960508	0.325565052	1.490642689	0.019868647	0.762	0.728	0.728	0.925	50.73	1.96	0.03	3.43E-06	512.12	162.52	4421	550.31	0.79
FWN17-145	29.8192	80.8624	2041	19B922_FWN17_145_Zr2	Ranimata	quartzite	1.558244685	0.883479257	0.581641110	1.785900179	0.022965507	0.750	0.714	0.714	0.920	47.95	2.40	0.03	2.67E-06	582.68	330.36	6359	660.32	0.70
FWN17-145	29.8192	80.8624	2041	19B923_FWN17_145_Zr3	Ranimata	quartzite	1.225469803	0.863948287	0.723235151	4.878220988	0.060169326	0.759	0.724	0.724	0.923	49.97	6.48	0.08	3.47E-06	353.57	249.26	10847	412.14	0.79
FWN17-155	29.9021	80.9483	3132	19B930_FWN17_155_Zr1	Greater Himalaya	augen gneiss	2.476134656	0.273500616	0.113312662	1.375623482	0.018901382	0.819	0.792	0.792	0.943	67.85	1.68	0.02	1.11E-05	223.78	24.72	1701	229.59	0.77
FWN17-155	29.9021	80.9483	3132	19B931_FWN17_155_Zr2	Greater Himalaya	augen gneiss	0.461499119	0.038683001	0.085989154	2.397667047	0.033097003	0.719	0.680	0.680	0.910	42.29	3.34	0.05	2.35E-06	196.02	16.43	2582	199.88	0.77
FWN17-155	29.9021	80.9483	3132	19B932_FWN17_155_Zr3	Greater Himalaya	augen gneiss	1.858808697	0.488553177	0.269632065	1.497233362	0.019650450	0.746	0.709	0.709	0.919	47.14	2.02	0.03	3.34E-06	556.27	146.20	4765	590.62	0.77
FWN17-158	29.8669	80.9116	2404	19B924_FWN17_158_Zr1	Ranimata	biotite schist	1.507933335	0.826885485	0.562545452	2.530763048	0.032207811	0.813	0.785	0.785	0.941	65.42	3.13	0.04	7.40E-06	203.70	111.70	3138	229.95	0.75
FWN17-158	29.8669	80.9116	2404	19B925_FWN17_158_Zr2	Ranimata	biotite schist	0.998226636	0.210713069	0.216549263	1.532094732	0.021091637	0.724	0.685	0.685	0.912	43.08	2.13	0.03	2.55E-06	391.94	82.73	3396	411.38	0.74
FWN17-158	29.8669	80.9116	2404	19B926_FWN17_158_Zr3	Ranimata	biotite schist	1.273076948	0.348317376	0.280682203	1.777530129	0.024346951	0.775	0.742	0.742	0.929	53.71	2.30	0.03	3.92E-06	324.39	88.75	3307	345.24	0.73
FWN17-197	29.5177	80.8210	1927	19B927_FWN17_197_Zr1	Kushma	quartzite	1.753913861	0.944885602	0.552669328	6.912723946	0.088317305	0.769	0.736	0.736	0.927	52.41	9.04	0.12	4.65E-06	377.57	203.41	15861	425.37	0.72
FWN17-197	29.5177	80.8210	1927	19B928_FWN17_197_Zr2	Kushma	quartzite	3.985390222	1.037940882	0.267175210	7.308609182	0.096091022	0.790	0.760	0.760	0.934	58.04	9.28	0.12	5.39E-06	739.55	192.61	30924	784.82	0.75
FWN17-197	29.5177	80.8210	1927	19B929_FWN17_197_Zr3	Kushma	quartzite	1.463485308	0.574806732	0.402928392	7.296590313	0.093849438	0.763	0.728	0.728	0.925	50.78	9.62	0.12	2.50E-06	585.49	229.96	25165	639.53	0.67