The Sensitivity of Temperature to Tachyhydrite Formation: Evidence from Evaporation Experiments of Simulated Brines Based on Compositions of Fluid Inclusions in Halite

Table 5

Major-ion chemical compositions and Jänecke coordinates of primary fluid inclusions from the Sergipe basin and the Congo basin.

Sample	Inclusion type	Mg	K	Ca	Na	Cl	2KCl	CaCl2	MgCl2
		mmol/kg H2O					Jänecke coordinates
Aptian: Sergipe basin, Brazil, Muribeca Formation [14]
792.2 m	Chevron	540	180	420	4300	6410	8.57	40.00	51.43
792.2 m	Chevron	970	250	570	3300	6630	7.51	34.23	58.26
792.2 m	Chevron	1090	260	570	3130	6730	7.26	31.84	60.89
792.2 m	Chevron	1100	240	630	3040	6750	6.49	34.05	59.46
792.2 m	Chevron	710	220	560	3780	6540	7.97	40.58	51.45
792.2 m	Chevron	910	240	620	3340	6660	7.27	37.58	55.15
792.2 m	Chevron	1010	240	640	3170	6710	6.78	36.16	57.06
792.2 m	Chevron	1130	250	640	2980	6780	6.60	33.77	59.63
792.2 m	Chevron	360	190	500	4480	6400	9.95	52.36	37.70
792.2 m	Chevron	900	250	600	3400	6650	7.69	36.92	55.38
792.2 m	Chevron	860	230	600	3460	6620	7.30	38.10	54.60
792.2 m	Chevron	1120	290	640	2990	6800	7.61	33.60	58.79
792.2 m	Chevron	1460	310	680	2430	7030	6.75	29.63	63.62
Average		935	242	590	3369	6670	7.52	36.83	55.65
Aptian: Congo basin, Congo, Loeme Formation [14]
746 m	Chevron	1580	220	1060	1830	7330	4.00	38.55	57.45
746 m	Chevron	1020	200	930	2760	6850	4.88	45.37	49.76
746 m	Chevron	910	180	870	3000	6750	4.81	46.52	48.66
746 m	Chevron	800	170	830	3240	6680	4.96	48.40	46.65
780 m	Chevron	2140	160	1320	1020	8100	2.26	37.29	60.45
780 m	Chevron	1180	150	1310	2060	7200	2.92	51.07	46.00
780 m	Chevron	1980	160	1600	950	8270	2.19	43.72	54.10
869 m	Chevron	2520	140	2610	240	10640	1.35	50.19	48.46
869 m	Chevron	3010	130	2780	130	11840	1.11	47.48	51.41
869 m	Chevron	2750	150	2700	180	11240	1.36	48.87	49.77
869 m	Chevron	2770	140	2640	190	11140	1.28	48.18	50.55
869 m	Chevron	2120	110	2250	500	9340	1.24	50.85	47.91
869 m	Chevron	1220	90	1970	1330	7800	1.39	60.90	37.71
869 m	Chevron	2840	130	2590	180	11170	1.18	47.13	51.68
869 m	Chevron	2170	100	2350	430	9580	1.09	51.42	47.48
869 m	Chevron	2640	120	2460	250	10570	1.16	47.68	51.16
Average		1978	147	1892	1143	9031	2.32	47.73	49.95