Table 1 Selected electron microprobe analyses of conjugate immiscible silicate (Ls) – carbonate (Lc) melts.

	Lc7	Ls7^‡	Lc10	Ls10-1^‡	Lc100	Ls100^‡	Lc101	Ls101^‡	Lp
		(−15% Lc7)		(−11% Lc10)		(−8% Lc100)		(−11% Lc101)
wt%
SiO₂	14.88	54.61	15.3	57.19	15.58	60.48	16.30	61.65	54.30
TiO₂	0.46	0.58	0.67	0.44	0.68	0.21	0.48	0.13	0.26
Al₂O₃	1.34	20.15	1.234	20.44	0.82	21.02	0.89	22.04	19.78
Cr₂O₃	0.079	bdl	bdl	bdl	0.13	bdl	bdl	0.24	0.04
FeO	2.31	2.11	2.34	1.73	3.04	1.40	3.16	2.10	1.68
MnO	0.553	0.37	0.731	0.30	1.40	0.508	1.05	0.058	0.2
MgO	0.741	0.117	0.565	0.03	0.49	0.07	0.32	0.11	0.33
CaO	51.61	0.69	46.78	0.36	52.39	0.69	51.58	bdl	3.83
P₂O₅	n.a.	n.a.	n.a.	n.a.	0.12	0.07	0.18	bdl
Na₂O	4.00	6.44	3.83	6.03	3.35	5.20	3.96	4.77	5.1
K2O	0.707	8.51	0.496	8.46	0.56	7.23	0.43	6.14	6.49
SO₃	0.445	0.91	0.512	2.02	0.30	0.239	0.33	0.159	0.76
Cl	0.4005	0.199	0.4157	0.173	0.41	0.188	0.49	0.175	0.22
F	4.036	0.461	3.966	0.157	3.97	0.25	4.20	0.16	0.42
CO₂					17.25^§		19.04^§	0.63	0.57
Sub total	81.56	95.15	76.84	97.34	100.48	97.56	102.42	98.35	94.01
Less O = F,Cl	1.79	0.24	1.76	0.11	1.76	0.15	1.88	0.11	0.23
Total	79.77	94.91	75.08	97.23	98.72	97.41	100.54	98.25	93.84
CO₂^†	20.23		24.92

Lp represents the calculated parental phonolite melt. All Ls-Lc EPMA analyses are shown in Supplementary Data 1.
bdl below detection limit, n.a. not analysed.
^† CO₂ in carbonate liquid estimated by difference to 100 wt% total.
^§ CO₂ with C measured quantitatively.
‡ Ls composition corrected for coalescing nm-sized Lc melt droplet component. Modal % Lc in Ls in parantheses.

Quick links

Search