Citation:

PANGAEA.914260

Name: Trace element compositions in clinopyroxene and plagioclase, and crystallization temperature estimated after Sun and Liang (2017) for Wadi Somerah, Oman
Published: 2020-03-31
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Formation of Layered Gabbros; Lower Oceanic Crust; Oman Ophiolite

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Published: 2020-03-31 • DOI registered: 2020-12-25

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Abstract:

As largest and best-exposed paleo-fast-spread oceanic crust on land, the Samail ophiolite in the Sultanate of Oman represents an ideal natural laboratory for investigating processes at fast-spreading mid-ocean ridges. We studied a layered gabbro sequence from the middle of the plutonic crust showing dm-scale modal layering with olivine abundance gradually decreasing from layer base to top (Wadi Somerah, Sumail block). Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was performed in order to obtain trace element contents and rare earth elements (REE) in particular. Analyses were performed at the Institut für Geowissenschaften (Christian-Albrechts-Universität zu Kiel, Germany) using a 193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to an Agilent 7900s ICP-MS. Analyses were performed as point measurements with 16 Hz pulse rate, 18 Jcm-2 fluence and a crater diameter of 120 µm on plagioclase, and 10 Hz, 12 Jcm-2 and a crater diameter of 32 µm on clinopyroxene. Differences in core and rim compositions of clinopyroxene reveal significant zonation with higher REE contents in the rim. Crystallization temperatures calculated using the REE-thermometer of Sun and Liang (2017; doi:10.1007/s00410-016-1326-9) vary between 1230 and 1300°C.

Keyword(s):

Formation of Layered Gabbros; Lower Oceanic Crust; Oman Ophiolite

Related to:

Mock, Dominik; Neave, David Axford; Müller, S; Garbe-Schönberg, Dieter; Namur, Olivier; Ildefonse, Benoit; Koepke, Jürgen (2021): Formation of igneous layering in the lower oceanic crust from the Samail Ophiolite, Sultanate of Oman. Journal of Geophysical Research: Solid Earth, 126, e2020JB019573, https://doi.org/10.1029/2020JB019573

Further details:

LA-ICP-MS_accuracy-control

LA-ICP-MS_calibration-material

LA-ICP-MS_data

Coverage:

Latitude: 23.092960 * Longitude: 58.104060

Minimum DEPTH, sediment/rock: 0.0400 m * Maximum DEPTH, sediment/rock: 2.6795 m

Event(s):

OM10-Sam (Wadi Somerah, Sumail block) * Latitude: 23.092960 * Longitude: 58.104060 * Elevation: 720.0 m * Location: Oman * Method/Device: Drilling/coring

Comment:

OM10-Sam: layer 6= 0-8 cm, layer 5= 8-57 cm, layer 4= 57-95 cm, layer 3= 95-136 cm, layer 2= 136-205 cm, layer 1= 205-285 cm

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Layer number	Layer		Mock, Dominik
2	Event layer type	ELT		Mock, Dominik
3	Sample code/label	Sample label		Mock, Dominik
4	DEPTH, sediment/rock	Depth sed	m	Mock, Dominik		Geocode – center of the thin-section/domain measured from top of the profile
5	Minerals	Minerals		Mock, Dominik
6	Analysis	Analysis		Mock, Dominik
7	Number of measurements	n	#	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
8	Calcium	Ca	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS	major element concentration (in weight percent) for Ca used as internal standard
9	Zirconium	Zr	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
10	Lanthanum	La	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
11	Cerium	Ce	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
12	Promethium	Pm	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
13	Neodymium	Nd	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
14	Samarium	Sm	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
15	Europium	Eu	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
16	Gadolinium	Gd	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
17	Terbium	Tb	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
18	Dysprosium	Dy	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
19	Yttrium	Y	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
20	Holmium	Ho	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
21	Erbium	Er	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
22	Thulium	Tm	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
23	Ytterbium	Yb	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
24	Lutetium	Lu	%	Mock, Dominik	193 nm ArF excimer laser ablation system (GeoLasPro HD, Coherent) coupled to Agilent 7900s ICP-MS
25	Crystallisation temperature	Cryst T	°C	Mock, Dominik	calculated using the REE (rare earth element) thermometer of Sun and Liang (2017)
26	Crystallisation temperature, standard deviation	Cryst temp std dev	±	Mock, Dominik

License:

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

Size:

600 data points

Data

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

1 Layer	2 ELT	3 Sample label	4 Depth sed [m]	5 Minerals	6 Analysis	7 n [#]	8 Ca [%]	9 Zr [%]	10 La [%]	11 Ce [%]	12 Pm [%]	13 Nd [%]	14 Sm [%]	15 Eu [%]	16 Gd [%]	17 Tb [%]	18 Dy [%]	19 Y [%]	20 Ho [%]	21 Er [%]	22 Tm [%]	23 Yb [%]	24 Lu [%]	25 Cryst T [°C]	26 Cryst temp std dev [±]
6	mafic	OM10-Sam_11	0.0400	plagioclase	core	16	16.87	0.02	0.477	1.073	0.145	0.597	0.114	0.351	0.095	0.012	0.055	0.256	0.009	0.019	0.002	0.009	0.001	1270	13
6	mafic	OM10-Sam_11	0.0400	clinopyroxene	core	16	21.71	4.99	0.125	0.705	0.185	1.287	0.709	0.277	1.143	0.226	1.515	8.475	0.319	0.898	0.126	0.799	0.115	1270	13
6	mafic	OM10-Sam_11	0.0400	clinopyroxene	rim	14	21.56	8.39	0.164	0.860	0.229	1.654	0.923	0.304	1.490	0.294	1.963	11.577	0.431	1.235	0.176	1.087	0.167	1270	13
5	mafic	OM10-Sam_9-1	0.4995	plagioclase	core	19	16.94	0.02	0.248	0.531	0.080	0.358	0.074	0.232	0.068	0.008	0.038	0.189	0.006	0.014	0.002	0.008	0.001	1232	10
5	mafic	OM10-Sam_9-1	0.4995	clinopyroxene	core	14	21.76	7.16	0.169	0.808	0.219	1.642	0.904	0.350	1.551	0.302	2.068	11.647	0.435	1.206	0.175	1.060	0.157	1232	10
5	mafic	OM10-Sam_9-1	0.4995	clinopyroxene	rim	15	21.68	9.18	0.172	0.816	0.230	1.798	1.001	0.368	1.762	0.345	2.359	13.715	0.504	1.378	0.206	1.204	0.184	1232	10
4	leucocratic	OM10-Sam_6-2	1.0870	plagioclase	core	24	16.77	0.01	0.280	0.640	0.089	0.397	0.084	0.277	0.069	0.008	0.039	0.188	0.007	0.014	0.002	0.008	0.001	1264	17
4	leucocratic	OM10-Sam_6-2	1.0870	clinopyroxene	core	16	21.79	4.51	0.112	0.617	0.159	1.160	0.634	0.258	1.038	0.203	1.352	7.633	0.289	0.812	0.115	0.692	0.101	1264	17
4	leucocratic	OM10-Sam_6-2	1.0870	clinopyroxene	rim	15	21.59	7.32	0.134	0.693	0.184	1.395	0.806	0.276	1.319	0.264	1.754	10.257	0.381	1.079	0.151	0.927	0.140	1264	17
3	mafic	OM10-Sam_5-2	1.2755	plagioclase	core	17	17.24	0.02	0.203	0.500	0.064	0.279	0.056	0.204	0.046	0.005	0.024	0.109	0.004	0.009	0.001	0.005	0.000	1230	12
3	mafic	OM10-Sam_5-2	1.2755	clinopyroxene	core	30	22.13	5.79	0.153	0.849	0.212	1.550	0.848	0.321	1.329	0.249	1.755	9.163	0.360	0.995	0.138	0.906	0.129	1230	12
3	mafic	OM10-Sam_5-2	1.2755	clinopyroxene	rim	20	22.48	8.53	0.160	0.870	0.233	1.788	0.951	0.331	1.656	0.317	2.229	12.118	0.473	1.308	0.177	1.145	0.163	1230	12
3	leucocratic	OM10-Sam_4-4	1.5395	plagioclase	core	28	16.86	0.02	0.181	0.425	0.064	0.296	0.070	0.219	0.066	0.009	0.047	0.229	0.008	0.018	0.002	0.011	0.001	1233	6
3	leucocratic	OM10-Sam_4-4	1.5395	clinopyroxene	core	15	21.83	6.58	0.154	0.774	0.215	1.598	0.869	0.342	1.483	0.290	1.938	10.747	0.399	1.126	0.162	0.967	0.141	1233	6
3	leucocratic	OM10-Sam_4-4	1.5395	clinopyroxene	rim	12	21.77	12.80	0.181	0.950	0.273	2.044	1.173	0.376	2.114	0.416	2.776	16.140	0.590	1.666	0.236	1.425	0.216	1233	6
2	mafic	OM10-Sam_3-3a	2.0270	plagioclase	core	21	16.86	0.01	0.339	0.770	0.102	0.426	0.086	0.278	0.067	0.008	0.038	0.176	0.006	0.013	0.001	0.006	0.001	1273	14
2	mafic	OM10-Sam_3-3a	2.0270	clinopyroxene	core	18	21.94	6.69	0.165	0.817	0.215	1.575	0.860	0.335	1.412	0.266	1.847	10.227	0.398	1.082	0.151	0.916	0.135	1273	14
2	mafic	OM10-Sam_3-3a	2.0270	clinopyroxene	rim	43	22.05	8.54	0.213	0.954	0.256	1.850	1.002	0.361	1.741	0.325	2.309	13.276	0.490	1.399	0.199	1.184	0.176	1273	14
1	leucocratic	OM10-Sam_3-3b	2.0470	plagioclase	core	21	16.95	0.01	0.235	0.582	0.081	0.354	0.072	0.237	0.061	0.007	0.033	0.162	0.006	0.012	0.001	0.006	0.001	1233	12
1	leucocratic	OM10-Sam_3-3b	2.0470	clinopyroxene	core	29	22.00	5.65	0.151	0.816	0.204	1.531	0.809	0.335	1.314	0.249	1.707	9.052	0.360	0.997	0.134	0.872	0.121	1233	12
1	leucocratic	OM10-Sam_3-3b	2.0470	clinopyroxene	rim	24	21.85	7.26	0.161	0.883	0.221	1.697	0.911	0.352	1.477	0.278	1.912	10.508	0.410	1.140	0.156	0.990	0.139	1233	12
1	mafic	OM10-Sam_1-1	2.6795	plagioclase	core	13	17.05	0.04	0.538	1.079	0.142	0.640	0.135	0.406	0.117	0.013	0.069	0.309	0.012	0.023	0.003	0.012	0.001	1297	18
1	mafic	OM10-Sam_1-1	2.6795	clinopyroxene	core	15	21.87	6.45	0.132	0.639	0.169	1.336	0.742	0.274	1.233	0.241	1.601	9.360	0.349	0.972	0.139	0.842	0.125	1297	18
1	mafic	OM10-Sam_1-1	2.6795	clinopyroxene	rim	14	21.45	15.67	0.205	0.979	0.264	2.061	1.079	0.320	1.821	0.357	2.375	14.444	0.517	1.484	0.217	1.316	0.202	1297	18