1D geothermal inversion of the lunar deep interior temperature and heat production in the equatorial area

Electrical Resistivity Measurements of Fe‐Si With Implications for the Early Lunar Dynamo

“…This study 330 The resulting q ad at the top of the core is considerably lower than the reported q ad of an Fe-S core (Jiang & Yao, 2019;Scheinberg et al, 2015;Stegman et al, 2003;Zhang et al, 2013). Gomi and Yoshino (2018) calculated ρ total of Fe-2.56 and Fe-8.11 wt%Si and Yin et al (2019) measured ρ total of Fe 3 P, which we use with equations 1 and 2 to obtain q ad .…”

“…As expected, the heat flux resulting from an Fe2Si core is greater than that resulting from an Fe17Si core due to the higher thermal conductivity of Fe2Si. The heat flux profile of an Fe core is obtained using the thermal conductivity values from Silber et al (2018), while that of an Fe‐S core, ranging from 4–8 wt%S, is obtained from Jiang and Yao (2019). Their estimates of q ad in the IC overlap the upper bounds of q ad for an Fe9Si or Fe17Si core, while they report generally larger values than for an Fe OC.…”

“…The upper bounds of each composition are obtained using the larger value of α and smaller value of C p,c as reported in Table 1, while the lower bounds use the smaller value of α and larger value of C p,c . Reference A is Silber et al (2018), which is used to calculate the lunar core q ad for a pure Fe core, while Fe‐S (4–8 wt%S) core is from Reference B (Jiang & Yao, 2019). The corresponding pressure and temperature at 330 km are 4.8 GPa and 1600 K (Garcia et al, 2012; Laneuville et al, 2014).…”

“…This suggests that q CMB was greater than q ad for a Fe-xSi (2 < x < 17 wt%Si) core until 3.32-3.80 Ga, depending on model chosen, and therefore could have been able to sustain a lunar dynamo by thermal convection. Thus, our age estimates pro- 2018), which is used to calculate the lunar core q ad for a pure Fe core, while Fe-S (4-8 wt%S) core is from Reference B (Jiang & Yao, 2019). The corresponding pressure and temperature at 330 km are 4.8 GPa and 1600 K (Garcia et al, 2012;Laneuville et al, 2014).…”

Electrical Resistivity of Fe and Fe‐3 wt%P at 5 GPa With Implications for the Moon's Core Conductivity and Dynamo

“…The adiabatic heat flux ( q ad ) across the CMB is calculated as 3.4–4.2 mW/m 2 for an iron model, 3.3–3.8 mW/m 2 for a Fe‐3 wt%P outer core, and 1.8–2.0 mW/m 2 for a Fe‐5 wt%S outer core. Compared with previous models, such as the Fe‐S model (Jiang & Yao, 2019; Laneuville et al., 2018; Pommier, 2020; Scheinberg et al., 2015; Stegman et al., 2003; N. Zhang et al., 2013), Fe‐Si model (Berrada et al., 2020) and Fe model (Evans et al., 2014; Laneuville et al., 2014; Silber et al., 2018), our results give moderate values of q ad through the lunar CMB (Table 3). On the other hand, Berrada et al.…”