Magma-assisted Continental Rifting: The Broadly Rifted Zone in SW Ethiopia, East Africa

Supporting information accompanying a paper entitled "Magma-assisted Continental Rifting: The Broadly Rifted Zone in SW Ethiopia, East Africa" submitted to AGU publications, Tectonics. The dataset contains apatite and zircon (U-Th-Sm)/He data from the southern Main Ethiopian Rift, Gofa Province and Chew Bahir Basin, as well as additional QTQt thermal models that are discussed in the paper.

Table 1 and 2 contain apatite  (AHe) (U-Th-Sm)/He (Table 1) and zircon (ZHe) (U-Th-Sm)/He (Table 2) single grain ages. Sampling locations are indicated in figure 2a in the main text. Data table 1 and 2 are similar with Table 1 and 2 in the main text. 

Table 3: Show Onset of cooling and cooling rate estimated for each model.

Supplementary information S1A and S1B show model input data and modeling strategy for QTQt (S1A1) and HeFTy (S1A2). 

Supplementary information S2A1–S2A4: Show AHe single grain ages plot against effective uranium concentration (eU) and grain size (ESR) colored with grain geometry (1, 2 or 0 terminations). Single grain ages excluded for QTQt modeling are denoted as asterisk. S2A5: AHe single grain ages plot against effective uranium concentration (eU) and grain size (ESR) colored with grain geometry (1, 2 or 0 terminations).

Supplementary information S3A1 shows all QTQt thermal modeling results for individual and elevation profile samples. The expected thermal history represents the weighted mean of all the models sampled (solid lines). For elevation profile samples, thermal history for the topmost and lowermost samples plotted in blue and red, respectively. For all models, the 95% confidence interval drawn as stippled lines.  For elevation profile samples, thermal histories for samples in between the top and lower are drawn in gray. 

Supplementary information S3A2: Shows individual HeFTy inverse and forward modeling results. Excluded single grain ages are denoted as transparent. Accepted thermal histories are indicated as green and the ''good'' fits are light purple. The orange boxes are time-temperature constraints. Note: M-1A and M-1B are model results for sample M-1. We rerun the same model to increase the number of "good" fit time temperature history paths for model M-1A..