How to Form Himalaya Mountain: Origin, Phases & Importance for India

The Himalayas are not just the tallest mountain range in the world—they are a result of millions of years of geological transformation. Many students wonder how to form the Himalaya Mountain and what forces shaped such massive structures. The answer lies deep within Earth’s tectonic movements, where continents collided and oceans disappeared.

Understanding their formation is important not only for geography exams but also to grasp climate patterns, natural resources, and environmental challenges in India.

The Complex Geological Origin of the Himalayas

It is a geological fact that approximately 500 million years ago, a vast ocean, known as the Tethys Sea, existed where the Himalayas stand today. This discussion will focus on understanding the complex geological origin of the Himalayas, which possesses a history far more extensive than its physical size.

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Importance of the Himalayas for India

The geographical location of the Himalayas is profoundly significant for India.

• Protection: They provide protection from the frigid Siberian winds originating from the North Pole.
• Monsoon Rainfall: The Himalayas play a crucial role in the heavy monsoon rainfall across the Indian subcontinent.
• Strategic Barrier: They serve as a formidable physical barrier against China.
• Freshwater Source: Water springs and glaciers found in the Himalayas are vital sources of fresh water.

A recent report indicates that due to accelerating climate change, 75% of Himalayan glaciers may melt within the next few decades, potentially leading to disastrous floods in the surrounding regions. Understanding the Himalayas and their origin is essential to comprehend the significant impact of climate change in this region.

How Mountains Form: An Introduction to Fold Mountains

Before delving into the complex geological history of the Himalayas, it is important to understand how mountains form. Mountains are categorized into various types:

• Volcanic Mountains
• Fold Mountains
• Fault-Block Mountains
• Dome-Shaped Mountains

This discussion will primarily focus on Fold Mountains.

Formation of Fold Mountains

A fold mountain forms when two or more continental tectonic plates push against each other. This creates immense geological pressure within the tectonic plates, causing the Earth’s surface to fold and rise into mountains. In geological terms, this process is known as orogeny.

The Formation Process of the Himalayas

The Himalayan Mountains are among the world’s tallest mountain ranges. They extend from the Pamir Knot in the west to the Purvanchal Mountains in the east. The Himalayas are not a single mountain but a group of several mountain ranges, including:

• Trans Himalayas
• Greater Himalayas
• Lesser Himalayas
• Outer Himalayas (Shivaliks)
• Purvanchal Himalayas

The Trans Himalayas can be further subdivided into the Karakoram, Ladakh, Kailash, and Zanskar ranges.

Geologists suggest that the Himalayas did not form in a single event but underwent a prolonged formation and development period, which can be divided into different phases.

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Early Stages: Indian Plate Collision

The formation of the Himalayas resulted from the collision of the Indian Plate with the Eurasian Plate.

• During the Cretaceous Period, the Indian Plate separated from Gondwana Land and began drifting northward.
• Subsequently, the Indian Plate collided with the Eurasian Plate.
• During this collision, the Indian Plate subducted beneath the Eurasian Plate, causing the floor of the Tethys Sea, along with all its sediments, to rise.
• The continuous northward movement of the Indian Plate increased both sedimentation and pressure.
• This led to the folding and rising of the layers of sediments from the Tethys Sea floor, initiating the formation of the Himalayan Mountains.

Phase 1: Formation of Trans Himalayas and Greater Himalayas

The first phase of Himalayan formation involved the creation of the Trans Himalayas and the Greater Himalayas. As previously mentioned, their formation resulted from the rising of the Tethys Sea floor, indicating a significant contribution of the original Tethys Sea floor sediments.

The black color of the sediments found in the Karakoram ranges is attributed to the living creatures present in the Tethys Sea. Under extreme pressure and sedimentation, these creatures transformed into black fossils, making most of the mountains in the Trans Himalayas appear black. The Trans Himalayan range also contains vast reserves of glaciers.

K2 (Godwin Austen), the world’s second-highest peak and India’s highest peak, is located in the Trans Himalayas. These mountain ranges have an average height of 3,000 meters and an average width of 40 kilometers. Most of the Trans Himalayas lie in the Tibet Region, extending into India primarily across the Jammu and Kashmir and Ladakh regions.

Phase 2: Formation of Lesser Himalayas or Middle Himalayas

Following the rise of the Trans Himalayas and Greater Himalayas, the Lesser Himalayas (also known as the Middle Himalayas) were formed. The Indian Plate and the Eurasian Plate continued to collide even after the initial formation of the Trans Himalayas. This continuous collision caused sediments deposited along the Main Boundary Fault to fold and rise as mountain ranges, which are known as the Lesser Himalayas.

Important ranges within the Lesser or Middle Himalayas include Pir Panjal, Dhauladhar, Mussoorie Range, Nag Tibba, and Mahabharat Ranges. Many popular hill stations like Shimla, Mussoorie, Ranikhet, Nainital, Almora, and Darjeeling are located in the Lesser Himalayas. Mountains of the Lesser Himalayas are found in Himachal Pradesh, Uttarakhand, Sikkim, and Arunachal Pradesh.

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Phase 3: Formation of Shivalik Mountains (Outer Himalayas)

The Shivalik Ranges (also known as the Outer Himalayas) were formed approximately 2 to 20 million years ago. These ranges are situated between the Lesser Himalayas and the Great Plains. They extend discontinuously for about 2400 kilometers from Himachal Pradesh to Arunachal Pradesh.

The Shivalik Range was formed from sand, gravel, and alluvial deposits brought by rivers flowing through the region. Due to compression, these deposits gradually hardened over time, leading to the formation of the Shivalik Range. 

Most mountains in the Shivalik Range are composed of sedimentary rocks such as sandstone, sandrock, clay, conglomerate, and limestone. Their average height ranges from 600 meters to 1500 meters. Their average width is 50 kilometers in Himachal Pradesh but narrows to just 15 kilometers in Arunachal Pradesh.

Phase 4: Formation of Purvanchal Himalayas

The Purvanchal Himalayas represent the final range of the Himalayas, located parallel to the India-Myanmar border from Arunachal Pradesh to Mizoram. Their rise is attributed to the southern (southward) bending of the Himalayan ranges, also known as Himalayan syntaxial bends.

Parts of the Mishmi Hills, Patkai-Bum, Naga Hills, and Lushai Hills of Mizoram are components of the Purvanchal Himalayas. These hills are generally lower in height compared to the Western Himalayas. The Purvanchal Himalayas are located in four Northeastern states of India: Arunachal Pradesh, Nagaland, Manipur, and Mizoram.

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