To optimize heating conditions during the Thellier procedure and to improve the reliability of paleofield determination, thermal stability experiments with titanomagnetite and titanomaghemite obtained by laboratory heating were conducted. The experiments were performed on P72/2 and P72/4 basalts of the rift zone of the Red Sea that contain titanomagnetite with a concentration of the magnetite component equal to (44.7 ± 3.9)% and (46 ± 5)%, respectively. It has been shown that the single-phase oxidation process prevails in annealing of titanomagnetite for 10 hours in a temperature range of 290–410°C in air. An increase in the annealing temperature up to 460–535°C means that single-phase oxidation is replaced by oxi-exsolution. The temperature range of thermal stability of the single-phase oxidized titanomagnetite expands with the degree of oxidation. In particular, at an oxidation state close to 0.9, titanomaghemite is stable up to temperatures of 410–460°C.The use of the Thellier technique for studying the properties of the chemical remanent magnetization of single-phase oxidized titanomagnetite with an oxidation state above z ≥ 0.6 is limited to approximately 20% of its value. It is possible to stabilize the single-phase oxidized state of titanomagnetite at temperatures above 460°C and thereby to improve the quality of CRM research using the Thellier method by adjusting the value of the oxygen partial pressure.

中文翻译：

---

空气和氩气加热过程中红海的钛磁铁矿玄武岩的稳定性

为了优化Thellier程序中的加热条件并提高古场测定的可靠性，进行了通过实验室加热获得的钛磁铁矿和钛磁铁矿的热稳定性实验。实验是在红海裂谷的P72 / 2和P72 / 4玄武岩上进行的，其中玄武岩中含有钛磁铁矿，其磁铁矿成分的浓度分别等于（44.7±3.9）％和（46±5）％。研究表明，在空气中温度为290-410°C的钛磁铁矿退火10小时后，单相氧化过程占主导地位。退火温度升高至460–535°C，意味着单相氧化被oxex-exsolution取代。单相氧化钛磁铁矿的热稳定性的温度范围随着氧化程度而扩大。特别是，在接近0.9的氧化态下，钛磁赤铁矿在410–460°C的温度下都稳定。Thellier技术用于研究氧化态高于0.5的单相氧化钛磁铁矿的化学剩余磁化性质。ž ≥0.6被限制在它的值的约20％。可以在460°C以上的温度下稳定钛磁铁矿的单相氧化态，从而通过调节氧分压的值，使用Thellier方法提高CRM研究的质量。