Madinah Region's Geological Legacy Reveals Ancient History And Agricultural Importance

Madinah, located in western Saudi Arabia, is part of the Arabian Shield, one of the oldest geological formations on the Arabian Peninsula. This vast rock mass dates back over 540 million years to the Precambrian period. Madinah's elevation ranges from 600 to 640 meters above sea level, surrounded by highlands except to the northwest.

Despite its arid climate, Madinah has flourished as a green oasis due to its fertile soil and abundant groundwater. The region is renowned for palm cultivation and diverse vegetation. Seasonal valleys contribute significantly to this fertility by enriching the soil with essential natural elements.

Madinah is encircled by notable mountains, with Mount Uhud being the most prominent. Located about 5.5 kilometers north of the Prophet's Mosque, it rises to approximately 1,077 meters above sea level and consists mainly of red Rhyolite igneous rocks. Westward, the Jamawat mountains reach around 965 meters and are characterized by granite and granodiorite formations.

Further west lies Jummah Mountain, stretching from Taibah University to Al-Salam neighborhood. It reaches about 944 meters in height and primarily comprises granite. Sela Mountain, northwest of the Prophet's Mosque, stands at approximately 681 meters with a base of hard gabbro rock.

Ayr Mountain, south of Madinah, is a notable volcanic feature surrounded by basalt rocks except on its northwest side. This indicates ancient volcanic activity in the region. Madinah boasts a rich variety of rock types from different geological stages, including basement rocks from the Precambrian period like rhyolite, dacite, and andesite.

Three massive volcanic lava flows (harrat) encircle Madinah. These features consist of dark basalt lava from later geological eras that cover vast areas around the city. Alongside these mountains and harrat are modern sediments forming a significant geological feature.

Valleys and Sedimentary Basins

The sedimentary basin in Madinah has an average height above sea level of 625 meters. These sediments result from erosion and weathering from surrounding mountainous heights. Seasonal valleys transport significant quantities of soil and rock fragments into Madinah during rainy seasons.

Al-Aqeeq Valley is among the most renowned valleys traversing Madinah from south to north. It converges with Qanat Valley west of Mount Uhud. Known for its fertility, it nourishes agricultural lands alongside other historic valleys in the region.

Construction Materials and Research Opportunities

Madinah's igneous rocks like granite, basalt, and andesite are valued for their density and pressure resistance. These qualities make them ideal for heavy construction projects seen in many urban developments across the region.

Apart from its religious significance, Madinah serves as an open geological museum showcasing diverse ancient history through its landforms. It offers researchers insights into natural forces shaping its features over millennia.

With inputs from SPA