Dissolution of clinopyroxene (cpx) in a K-basaltic melt from the Campi Flegrei Volcanic District (Italy) has been investigated through dissolution and dissolution-crystallization experiments at pressure of 0.8 GPa, superliquidus temperature of 1350 °C, and dwell times between 0.5 and 1 h. The obtained dissolution rates range from 7.9·10⁻⁶ cm s⁻¹ to 6.1·10⁻⁶ cm s⁻¹ as a function of dwell time. In the dissolution-crystallization experiment (1300 °C; 0.8 GPa; 2 h), the formation of overgrowth rims accompanied by new cpx crystals suggests that the injection of recharge magmas in basaltic reservoir may lead to inverse or oscillatory zonation. The interaction between cpx and K-basaltic melt at ~1570 °C was studied by in situ radiography using synchrotron radiation combined with the Paris-Edinburgh press. This resulted in cpx resorption to occur depending on the temperature conditions with respect to the liquidus temperature of the cpx (T_cpxL). The calculated cpx dissolution rates are ~5·10⁻³ cm s⁻¹ at T ≤ T_cpxL and ~ 3·10⁻² cm s⁻¹ at T ≥ T_cpxL. The role of crystal dissolution in the estimation of magma residence times has been also tested for a natural magmatic system by interpolating the dissolution rates (~10⁻⁵–10⁻⁶ cm s⁻¹) with the textural data of cpx phenocrysts from the Agnano-Monte Spina pyroclastic deposit at Campi Flegrei caldera (Campanian region, Italy). Results from calculations indicate that the time required for partial or complete resorption of phenocrysts varies from ~0.5 to ~40 h, and that the effect of crystal dissolution may be relevant to estimate magma residence times whether significant dissolution occurs during magma mixing processes.

已经通过溶解和溶解-结晶实验研究了单斜辉石 (cpx) 在来自 Campi Flegrei 火山区（意大利）的 K-玄武岩熔体中的溶解，压力为 0.8 GPa，超液相线温度为 1350 °C，停留时间为 0.5 到1 小时。获得的溶解速率范围从7.9·10 ^-6  cm s ^-1到6.1·10 ^-6  cm s ^-1作为停留时间的函数。在溶解-结晶实验（1300℃；0.8GPa；2h）中，伴随新cpx晶体的过度生长边缘的形成表明玄武岩储层中补给岩浆的注入可能导致反向或振荡分带。通过使用同步辐射结合巴黎-爱丁堡压力机的原位射线照相术研究了 cpx 和 K-玄武岩熔体在~1570°C 之间的相互作用。这导致根据相对于 cpx 液相线温度 ( T _cpxL )的温度条件发生 cpx 再吸收。计算出的 cpx 溶解速率为 ~5·10 ^-3  cm s ^-1在T  ≤  T _cpxL和 ~ 3·10 ^-2 cm s ^-1在T  ≥  T _cpxL。晶体溶解在估计岩浆停留时间中的作用也已通过将溶解速率（~10 ^-5 –10 ^-6  cm s ^-1）与来自阿格纳诺的 cpx 斑晶的纹理数据进行插值来测试天然岩浆系统-位于 Campi Flegrei 火山口（意大利坎帕尼亚地区）的 Monte Spina 火山碎屑沉积物。计算结果表明，斑晶部分或完全吸收所需的时间从约 0.5 小时到约 40 小时不等，晶体溶解的影响可能与估计岩浆停留时间有关，无论在岩浆混合过程中是否发生显着溶解。