Structure of lamprophyres: a discriminant marker for Variscan and Alpine tectonics in the Argentera-Mercantour Massif, Maritime Alps

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Table 1

Major (wt.%) and trace (ppm) element concentrations of lamprophyres from Valscura and Val du Haut Boréon. Abbreviations: sp: spessartite; mel sp: melanocratic spessartite; c-l ap: comb layered appinite; ap: appinite; leuco ap: leuco-appinite.

	Val du Haut Boréon									Valscura

	sp LMA6	sp LMC22	mel sp B168A	mel sp B168B	mel sp LMC13	c-l ap LMC8	ap LMC9	ap LMC25	leuco ap B169	sp LMD2	ap LMB26
SiO₂	54.56	53.28	58.36	53.28	53.16	55.98	60.21	53.05	56.17	50.96	54.24
TiO2	1.58	1.38	0.83	1.37	1.13	0.93	0.73	1.19	0.80	1.18	1.12
Al₂O₃	15.28	16.31	17.53	15.93	14.73	20.10	17.65	14.41	21.08	13.22	15.97
FeOt	8.08	7.91	5.33	7.16	7.99	5.52	5.38	8.06	5.11	9.65	7.06
MgO	4.83	6.83	2.92	6.35	5.93	2.61	4.15	5.78	2.11	8.31	6.15
CaO	4.28	3.98	5.42	7.11	7.12	4.95	4.94	7.25	5.12	8.41	7.59
Na₂O	4.13	2.75	3.97	4.15	3.98	4.31	2.89	4.08	4.13	1.98	3.08
K₂O	1.82	2.23	2.22	2.26	1.61	1.75	2.19	1.72	2.05	1.26	2.11
P₂O₅	0.72	0.38	0.32	0.57	0.67	0.43	0.21	0.95	0.44	0.96	0.74
MnO	0.15	0.12	0.10	0.11	0.10	0.13	0.08	0.13	0.11	0.15	0.11
LOI	2.85	3.10	1.42	1.10	1.88	1.75	1.45	1.63	1.52	2.21	1.47
Total	98.28	98.27	98.42	99.39	98.30	98.46	99.88	98.25	98.64	98.29	99.64
Mg#	0.37	0.46	0.35	0.47	0.43	0.32	0.44	0.42	0.29	0.46	0.47
Rb	100.2	71.8	76.9	75.5	65.5	84.4	81.4	58.4	85.7	54.3	75.2
Ba	258	398.5	1183	1078	875.8	1769	1027	835.3	1889	628	1075
Sr	269	373	772	528	479	1017	436	457	1048	320	494
Pb	21.6	22.8	26.9	25.2	24.2	35.0	8.0	23.6	35.3	13.8	26.1
Th	6.6	5.5	5.4	6.2	6.6	5.3	4.2	4.3	5.2	4.5	5.6
Zr	274	182	193	234	230	357	254	227	381	117	238
Ta	6.8	3.3	3.6	4.3	4.1	4.4	5.2	3.9	3.9	3.7	5.9
Y	43	31	20	34	38	17	15	38	15	47	32
Nb	16	10	12	10	12	10	10	13	10	14	10
Cr	17	20	15	191	94	17	290	92	17	66	185
Ni	33	83	7	64	27	6	26	28	6	14	70
Co	12.8	17.3	12.5	26.1	26.2	6.0	16.5	26.5	5.7	35.2	26.8
V	144	332	111	212	213	70	113	214	68	373	213
Ga	18.7	22.2	21.1	22.2	21.3	24.0	20.1	21.5	24.3	21.4	22.1
Cu	8.7	11.3	5.7	17.9	35.9	8.3	20.2	38.5	8.6	20.5	19.2

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