Multiphase Alkaline Basalts of Central Al-Haruj Al-Abyad of Libya: Petrological and Geochemical Aspects

Table 1

Statistical parameters of the major and trace elements analyses of four phases of the central Al-Haruj al-Abyad basalt flows, central Libya.

	Phase 1			Phase 2			Phase 3			Phase 4
	No.	Range	Mean	No.	Range	Mean	No.	Range	Mean	No.	Range	Mean
SiO2	63	40.3–48.1	45.5	89	39.95–50.21	45.07	40	40.8–49.8	45.4	32	39.5–49.3	45.85
TiO2	63	1.66–3.00	2.09	89	1.36–3.34	2.19	40	1.47–2.96	2.159	32	1.70–0.7	2.01
Al2O3	63	10.24–15.2	13.1	88	9.58–15.50	12.58	40	9.64–14.7	12.76	32	10.5–14	12.61
Fe2O3	63	10.50–14.4	12.7	89	11.08–14.21	12.76	40	10.6–14.5	12.94	32	11.8–13.9	12.65
MnO	63	0.06–0.40	0.17	19	0.07–0.35	0.17	40	0.10–0.38	0.174	32	0.13–0.35	0.167
MgO	63	5.63–12.7	9.46	19	8.17–13.97	10.92	40	5.9–13.5	9.79	32	6.74–12.6	9.61
CaO	76	8.55–13.8	10.4	19	8.37–12.20	10.88	40	8.66–12.9	10.44	32	8.68–11.7	10.18
Na2O	47	2.11–3.63	2.85	19	1.64–3.60	2.62	18	1.21–3.89	2.74	26	2.13–3.30	2.77
K2O	76	0.21–1.34	0.73	19	0.42–1.30	0.83	40	0.27–1.11	0.72	32	0.49–1.20	0.73
P2O5	76	0.10–0.82	0.32	19	0.16–0.54	0.32	40	0.17–0.81	0.37	32	0.16–0.60	0.34
LOI	75	0.12–3.89	1.35	19	0.04–2.97	1.61	38	0.12–3.56	1.34	32	0.20–2.80	1.34
SO3	76	0.02–3.17	0.75	19	0.04–1.14	0.42	40	0.05–2.10	0.89	32	0.21–2.53	1.04
Sr	14	85–454	1448	19	85–4784	1083	10	293–2007	852	7	190–2316	702.8
Ba	14	170–1718	679.9	19	118–2782	1088	10	150–4166	1097	7	150–1616	664.5
As	14	0.70–1.6	1.05	19	0.10–3.80	1.36	10	1.00–2.13	1.31	7	1-1	1
Rb	14	8.40–21	13.8	19	12–19.80	15.85	10	5.18–25.6	16.1	7	11.8–21	16.47
Y	14	14–18	15.7	19	13.5–18.30	15.78	10	16.3–20	18	7	15.1–17.5	16.36
Zr	14	107–147	124	19	109–159.00	128.8	10	132–187	157.7	7	119–144	132
Nb	14	19–29	23.9	19	24.7–35.40	29.63	10	35.2–51	44.39	7	32–41.80	35.41
Cs	14	0.24–0.34	0.25	19	0.10–0.34	0.247	10	0.24–0.40	0.271	7	0.24–0.25	0.24
La	14	13.30–18	15.8	19	19.50–25.2	22	10	24.3–35.1	29.95	7	24–27.7	25.64
Ce	14	28.4–37	32.5	19	4.30–56.4	40	10	47.7–72.4	60.45	7	33–54.4	46
Pr	14	3.60–4.9	4.26	19	4.38–109	11	10	6.1–8.96	7.587	7	4.2–6.86	5.97
Nd	14	16.0–21.8	18.6	19	18.40–29.3	23.2	10	25.7–35.5	30.96	7	17.7–30.3	24.88
Sm	14	3.98–5.3	4.62	19	1.00–6.63	5.07	10	5.98–8.06	6.992	7	4.4–6.4	5.46
Eu	14	1.25–1.9	1.53	19	1.44–12	2.34	10	1.8–2.75	2.224	7	1.54–2.06	1.83
Gd	14	3.72–5	4.41	19	3.80–15.2	5.43	10	5–7.40	6.039	7	4.15–6.5	4.98
Tb	14	0.57–0.85	0.71	19	0.49–109	6.80	10	0.79–1.1	0.933	7	0.67–1.1	0.80
Dy	14	3.10–4.00	3.55	19	2.98–19.6	4.58	10	3.65–5.30	4.434	7	3.18–4.24	3.74
Ho	14	0.61–0.90	0.71	19	0.60–1.00	0.75	10	0.60–1.05	0.814	7	0.55–0.85	0.71
Er	14	1.37–1.78	1.58	19	1.32–12	2.15	10	1.36–2.14	1.685	7	1.59–1.8	1.67
Tm	14	0.18–0.34	0.24	19	0.17–15	1.03	10	0.16–0.33	0.236	7	0.2–0.34	0.26
Yb	14	1.10–1.49	1.32	19	1.10–109	7.01	10	1.18–1.80	1.365	7	1.01–1.5	1.28
Lu	14	0.16–0.3	0.21	19	0.15–19.6	1.23	10	0.14–0.26	0.204	7	0.17–0.28	0.21
Hf	14	2.20–3.4	2.75	19	1.0–3.8	3.02	10	2.80–4.30	3.48	7	2.4–3.3	2.95
Ta	14	1.40–2.52	2.02	19	1.87–12	3.18	10	3.12–4.10	3.69	7	2.1–4.3	3.04
Th	14	1.18–2.7	1.91	19	1.85–4.7	2.72	10	2.42–4.70	3.55	7	2.1–3.9	2.94

No.: number of analyses, LOI: loss on ignition.